refactor: update mailer service to stop using postmark (#38)

* refactor: update mailer service to stop using postmark

* chore: remove postmark as a dep and move out postmark code

* chore: remove postmark variables from .env.example

* chore: add formal errors for mailer initialization errors

* chore: add and update jsdoc comments in mailer service methods

packages/hoppscotch-backend/.env.example

@@ -1,9 +1,9 @@
 # Prisma Config
 DATABASE_URL=postgresql://postgres:testpass@dev-db:5432/hoppscotch
 
-# Postmark Config
+# Mailer config
-POSTMARK_SERVER_TOKEN=************************************************"
+MAILER_SMTP_URL="smtps://user@domain.com:pass@smtp.domain.com"
-POSTMARK_SENDER_EMAIL=************************************************"
+MAILER_ADDRESS_FROM='"From Name Here" <from@example.com>'
 
 # Auth Tokens Config
 JWT_SECRET='add some secret here'

packages/hoppscotch-backend/nest-cli.json

@@ -1,5 +1,11 @@
 {
   "$schema": "https://json.schemastore.org/nest-cli",
   "collection": "@nestjs/schematics",
-  "sourceRoot": "src"
+  "sourceRoot": "src",
+  "compilerOptions": {
+    "assets": [
+      "**/*.hbs"
+    ],
+    "watchAssets": true
+  }
 }

packages/hoppscotch-backend/package.json

@@ -23,6 +23,7 @@
     "test:e2e": "jest --config ./test/jest-e2e.json"
   },
   "dependencies": {
+    "@nestjs-modules/mailer": "^1.8.1",
     "@nestjs/apollo": "^10.1.6",
     "@nestjs/common": "^9.2.1",
     "@nestjs/core": "^9.2.1",
@@ -44,16 +45,17 @@
     "graphql-query-complexity": "^0.12.0",
     "graphql-redis-subscriptions": "^2.5.0",
     "graphql-subscriptions": "^2.0.0",
+    "handlebars": "^4.7.7",
     "io-ts": "^2.2.16",
     "ioredis": "^5.2.4",
     "luxon": "^3.2.1",
+    "nodemailer": "^6.9.1",
     "passport": "^0.6.0",
     "passport-github2": "^0.1.12",
     "passport-google-oauth20": "^2.0.0",
     "passport-jwt": "^4.0.1",
     "passport-local": "^1.0.0",
     "passport-microsoft": "^1.0.0",
-    "postmark": "^3.0.15",
     "prisma": "^4.7.1",
     "reflect-metadata": "^0.1.13",
     "rimraf": "^3.0.2",
@@ -72,6 +74,7 @@
     "@types/jest": "^29.4.0",
     "@types/luxon": "^3.2.0",
     "@types/node": "^18.11.10",
+    "@types/nodemailer": "^6.4.7",
     "@types/passport-github2": "^1.2.5",
     "@types/passport-google-oauth20": "^2.0.11",
     "@types/passport-jwt": "^3.0.8",

packages/hoppscotch-backend/src/errors.ts

@@ -540,3 +540,16 @@ export const USER_NOT_OWNER = 'user_coll/user_not_owner' as const;
  * (UserCollectionService)
  */
 export const USER_COLL_INVALID_JSON = 'user_coll/invalid_json';
+
+/*
+ * MAILER_SMTP_URL environment variable is not defined
+ * (MailerModule)
+ */
+export const MAILER_SMTP_URL_UNDEFINED = 'mailer/smtp_url_undefined' as const;
+
+/**
+ * MAILER_ADDRESS_FROM environment variable is not defined
+ * (MailerModule)
+ */
+export const MAILER_FROM_ADDRESS_UNDEFINED =
+  'mailer/from_address_undefined' as const;

packages/hoppscotch-backend/src/mailer/mailer.module.ts

@@ -1,7 +1,29 @@
 import { Module } from '@nestjs/common';
+import { MailerModule as NestMailerModule } from '@nestjs-modules/mailer';
+import { HandlebarsAdapter } from '@nestjs-modules/mailer/dist/adapters/handlebars.adapter';
 import { MailerService } from './mailer.service';
+import { throwErr } from 'src/utils';
+import {
+  MAILER_FROM_ADDRESS_UNDEFINED,
+  MAILER_SMTP_URL_UNDEFINED,
+} from 'src/errors';
 
 @Module({
+  imports: [
+    NestMailerModule.forRoot({
+      transport:
+        process.env.MAILER_SMTP_URL ?? throwErr(MAILER_SMTP_URL_UNDEFINED),
+      defaults: {
+        from:
+          process.env.MAILER_ADDRESS_FROM ??
+          throwErr(MAILER_FROM_ADDRESS_UNDEFINED),
+      },
+      template: {
+        dir: __dirname + '/templates',
+        adapter: new HandlebarsAdapter(),
+      },
+    }),
+  ],
   providers: [MailerService],
   exports: [MailerService],
 })

packages/hoppscotch-backend/src/mailer/mailer.service.ts

@@ -1,37 +1,52 @@
-import { Injectable, OnModuleInit } from '@nestjs/common';
+import { Injectable } from '@nestjs/common';
-import { Email } from 'src/types/Email';
 import {
   MailDescription,
   UserMagicLinkMailDescription,
 } from './MailDescriptions';
-import * as postmark from 'postmark';
 import { throwErr } from 'src/utils';
 import * as TE from 'fp-ts/TaskEither';
-import { EMAIL_FAILED, SENDER_EMAIL_INVALID } from 'src/errors';
+import { EMAIL_FAILED } from 'src/errors';
+import { MailerService as NestMailerService } from '@nestjs-modules/mailer';
 
 @Injectable()
-export class MailerService implements OnModuleInit {
+export class MailerService {
-  client: postmark.ServerClient;
+  constructor(private readonly nestMailerService: NestMailerService) {}
 
-  onModuleInit() {
+  /**
-    this.client = new postmark.ServerClient(
+   * Takes an input mail description and spits out the Email subject required for it
-      process.env.POSTMARK_SERVER_TOKEN || throwErr(SENDER_EMAIL_INVALID),
+   * @param mailDesc The mail description to get subject for
-    );
+   * @returns The subject of the email
+   */
+  private resolveSubjectForMailDesc(
+    mailDesc: MailDescription | UserMagicLinkMailDescription,
+  ): string {
+    switch (mailDesc.template) {
+      case 'team-invitation':
+        return `${mailDesc.variables.invitee} invited you to join ${mailDesc.variables.invite_team_name} in Hoppscotch`;
+
+      case 'code-your-own':
+        return 'Sign in to Hoppscotch';
+    }
   }
 
+  /**
+   * Sends an email to the given email address given a mail description
+   * @param to The email address to be sent to (NOTE: this is not validated)
+   * @param mailDesc Definition of what email to be sent
+   */
   sendMail(
     to: string,
     mailDesc: MailDescription | UserMagicLinkMailDescription,
   ) {
     return TE.tryCatch(
-      () =>
+      async () => {
-        this.client.sendEmailWithTemplate({
+        await this.nestMailerService.sendMail({
-          To: to,
+          to,
-          From:
+          template: mailDesc.template,
-            process.env.POSTMARK_SENDER_EMAIL || throwErr(SENDER_EMAIL_INVALID),
+          subject: this.resolveSubjectForMailDesc(mailDesc),
-          TemplateAlias: mailDesc.template,
+          context: mailDesc.variables,
-          TemplateModel: mailDesc.variables,
+        });
-        }),
+      },
       () => EMAIL_FAILED,
     );
   }
@@ -44,15 +59,12 @@ export class MailerService implements OnModuleInit {
    */
   async sendAuthEmail(to: string, mailDesc: UserMagicLinkMailDescription) {
     try {
-      const res = await this.client.sendEmailWithTemplate({
+      await this.nestMailerService.sendMail({
-        To: to,
+        to,
-        From:
+        template: mailDesc.template,
-          process.env.POSTMARK_SENDER_EMAIL ||
+        subject: this.resolveSubjectForMailDesc(mailDesc),
-          throwErr('No Postmark Sender Email defined'),
+        context: mailDesc.variables,
-        TemplateAlias: mailDesc.template,
-        TemplateModel: mailDesc.variables,
       });
-      return res;
     } catch (error) {
       return throwErr(EMAIL_FAILED);
     }

packages/hoppscotch-backend/src/mailer/templates/code-your-own.hbs

@@ -0,0 +1,526 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml">
+  <head>
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <meta name="x-apple-disable-message-reformatting" />
+    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
+    <meta name="color-scheme" content="light dark" />
+    <meta name="supported-color-schemes" content="light dark" />
+    <title></title>
+    <!--
+    The style block is collapsed on page load to save you some scrolling.
+    Postmark automatically inlines all CSS properties for maximum email client
+    compatibility. You can just update styles here, and Postmark does the rest.
+  -->
+    <style type="text/css" rel="stylesheet" media="all">
+    /* Base ------------------------------ */
+    
+    @import url("https://fonts.googleapis.com/css?family=Nunito+Sans:400,700&display=swap");
+    body {
+      width: 100% !important;
+      height: 100%;
+      margin: 0;
+      -webkit-text-size-adjust: none;
+    }
+    
+    a {
+      color: #3869D4;
+    }
+    
+    a img {
+      border: none;
+    }
+    
+    td {
+      word-break: break-word;
+    }
+    
+    .preheader {
+      display: none !important;
+      visibility: hidden;
+      mso-hide: all;
+      font-size: 1px;
+      line-height: 1px;
+      max-height: 0;
+      max-width: 0;
+      opacity: 0;
+      overflow: hidden;
+    }
+    /* Type ------------------------------ */
+    
+    body,
+    td,
+    th {
+      font-family: "Nunito Sans", Helvetica, Arial, sans-serif;
+    }
+    
+    h1 {
+      margin-top: 0;
+      color: #333333;
+      font-size: 22px;
+      font-weight: bold;
+      text-align: left;
+    }
+    
+    h2 {
+      margin-top: 0;
+      color: #333333;
+      font-size: 16px;
+      font-weight: bold;
+      text-align: left;
+    }
+    
+    h3 {
+      margin-top: 0;
+      color: #333333;
+      font-size: 14px;
+      font-weight: bold;
+      text-align: left;
+    }
+    
+    td,
+    th {
+      font-size: 16px;
+    }
+    
+    p,
+    ul,
+    ol,
+    blockquote {
+      margin: .4em 0 1.1875em;
+      font-size: 16px;
+      line-height: 1.625;
+    }
+    
+    p.sub {
+      font-size: 13px;
+    }
+    /* Utilities ------------------------------ */
+    
+    .align-right {
+      text-align: right;
+    }
+    
+    .align-left {
+      text-align: left;
+    }
+    
+    .align-center {
+      text-align: center;
+    }
+    /* Buttons ------------------------------ */
+    
+    .button {
+      background-color: #3869D4;
+      border-top: 10px solid #3869D4;
+      border-right: 18px solid #3869D4;
+      border-bottom: 10px solid #3869D4;
+      border-left: 18px solid #3869D4;
+      display: inline-block;
+      color: #FFF;
+      text-decoration: none;
+      border-radius: 3px;
+      box-shadow: 0 2px 3px rgba(0, 0, 0, 0.16);
+      -webkit-text-size-adjust: none;
+      box-sizing: border-box;
+    }
+    
+    .button--green {
+      background-color: #22BC66;
+      border-top: 10px solid #22BC66;
+      border-right: 18px solid #22BC66;
+      border-bottom: 10px solid #22BC66;
+      border-left: 18px solid #22BC66;
+    }
+    
+    .button--red {
+      background-color: #FF6136;
+      border-top: 10px solid #FF6136;
+      border-right: 18px solid #FF6136;
+      border-bottom: 10px solid #FF6136;
+      border-left: 18px solid #FF6136;
+    }
+    
+    @media only screen and (max-width: 500px) {
+      .button {
+        width: 100% !important;
+        text-align: center !important;
+      }
+    }
+    /* Attribute list ------------------------------ */
+    
+    .attributes {
+      margin: 0 0 21px;
+    }
+    
+    .attributes_content {
+      background-color: #F4F4F7;
+      padding: 16px;
+    }
+    
+    .attributes_item {
+      padding: 0;
+    }
+    /* Related Items ------------------------------ */
+    
+    .related {
+      width: 100%;
+      margin: 0;
+      padding: 25px 0 0 0;
+      -premailer-width: 100%;
+      -premailer-cellpadding: 0;
+      -premailer-cellspacing: 0;
+    }
+    
+    .related_item {
+      padding: 10px 0;
+      color: #CBCCCF;
+      font-size: 15px;
+      line-height: 18px;
+    }
+    
+    .related_item-title {
+      display: block;
+      margin: .5em 0 0;
+    }
+    
+    .related_item-thumb {
+      display: block;
+      padding-bottom: 10px;
+    }
+    
+    .related_heading {
+      border-top: 1px solid #CBCCCF;
+      text-align: center;
+      padding: 25px 0 10px;
+    }
+    /* Discount Code ------------------------------ */
+    
+    .discount {
+      width: 100%;
+      margin: 0;
+      padding: 24px;
+      -premailer-width: 100%;
+      -premailer-cellpadding: 0;
+      -premailer-cellspacing: 0;
+      background-color: #F4F4F7;
+      border: 2px dashed #CBCCCF;
+    }
+    
+    .discount_heading {
+      text-align: center;
+    }
+    
+    .discount_body {
+      text-align: center;
+      font-size: 15px;
+    }
+    /* Social Icons ------------------------------ */
+    
+    .social {
+      width: auto;
+    }
+    
+    .social td {
+      padding: 0;
+      width: auto;
+    }
+    
+    .social_icon {
+      height: 20px;
+      margin: 0 8px 10px 8px;
+      padding: 0;
+    }
+    /* Data table ------------------------------ */
+    
+    .purchase {
+      width: 100%;
+      margin: 0;
+      padding: 35px 0;
+      -premailer-width: 100%;
+      -premailer-cellpadding: 0;
+      -premailer-cellspacing: 0;
+    }
+    
+    .purchase_content {
+      width: 100%;
+      margin: 0;
+      padding: 25px 0 0 0;
+      -premailer-width: 100%;
+      -premailer-cellpadding: 0;
+      -premailer-cellspacing: 0;
+    }
+    
+    .purchase_item {
+      padding: 10px 0;
+      color: #51545E;
+      font-size: 15px;
+      line-height: 18px;
+    }
+    
+    .purchase_heading {
+      padding-bottom: 8px;
+      border-bottom: 1px solid #EAEAEC;
+    }
+    
+    .purchase_heading p {
+      margin: 0;
+      color: #85878E;
+      font-size: 12px;
+    }
+    
+    .purchase_footer {
+      padding-top: 15px;
+      border-top: 1px solid #EAEAEC;
+    }
+    
+    .purchase_total {
+      margin: 0;
+      text-align: right;
+      font-weight: bold;
+      color: #333333;
+    }
+    
+    .purchase_total--label {
+      padding: 0 15px 0 0;
+    }
+    
+    body {
+      background-color: #F2F4F6;
+      color: #51545E;
+    }
+    
+    p {
+      color: #51545E;
+    }
+    
+    .email-wrapper {
+      width: 100%;
+      margin: 0;
+      padding: 0;
+      -premailer-width: 100%;
+      -premailer-cellpadding: 0;
+      -premailer-cellspacing: 0;
+      background-color: #F2F4F6;
+    }
+    
+    .email-content {
+      width: 100%;
+      margin: 0;
+      padding: 0;
+      -premailer-width: 100%;
+      -premailer-cellpadding: 0;
+      -premailer-cellspacing: 0;
+    }
+    /* Masthead ----------------------- */
+    
+    .email-masthead {
+      padding: 25px 0;
+      text-align: center;
+    }
+    
+    .email-masthead_logo {
+      width: 94px;
+    }
+    
+    .email-masthead_name {
+      font-size: 16px;
+      font-weight: bold;
+      color: #A8AAAF;
+      text-decoration: none;
+      text-shadow: 0 1px 0 white;
+    }
+    /* Body ------------------------------ */
+    
+    .email-body {
+      width: 100%;
+      margin: 0;
+      padding: 0;
+      -premailer-width: 100%;
+      -premailer-cellpadding: 0;
+      -premailer-cellspacing: 0;
+    }
+    
+    .email-body_inner {
+      width: 570px;
+      margin: 0 auto;
+      padding: 0;
+      -premailer-width: 570px;
+      -premailer-cellpadding: 0;
+      -premailer-cellspacing: 0;
+      background-color: #FFFFFF;
+    }
+    
+    .email-footer {
+      width: 570px;
+      margin: 0 auto;
+      padding: 0;
+      -premailer-width: 570px;
+      -premailer-cellpadding: 0;
+      -premailer-cellspacing: 0;
+      text-align: center;
+    }
+    
+    .email-footer p {
+      color: #A8AAAF;
+    }
+    
+    .body-action {
+      width: 100%;
+      margin: 30px auto;
+      padding: 0;
+      -premailer-width: 100%;
+      -premailer-cellpadding: 0;
+      -premailer-cellspacing: 0;
+      text-align: center;
+    }
+    
+    .body-sub {
+      margin-top: 25px;
+      padding-top: 25px;
+      border-top: 1px solid #EAEAEC;
+    }
+    
+    .content-cell {
+      padding: 45px;
+    }
+    /*Media Queries ------------------------------ */
+    
+    @media only screen and (max-width: 600px) {
+      .email-body_inner,
+      .email-footer {
+        width: 100% !important;
+      }
+    }
+    
+    @media (prefers-color-scheme: dark) {
+      body,
+      .email-body,
+      .email-body_inner,
+      .email-content,
+      .email-wrapper,
+      .email-masthead,
+      .email-footer {
+        background-color: #333333 !important;
+        color: #FFF !important;
+      }
+      p,
+      ul,
+      ol,
+      blockquote,
+      h1,
+      h2,
+      h3,
+      span,
+      .purchase_item {
+        color: #FFF !important;
+      }
+      .attributes_content,
+      .discount {
+        background-color: #222 !important;
+      }
+      .email-masthead_name {
+        text-shadow: none !important;
+      }
+    }
+
+    :root {
+      color-scheme: light dark;
+      supported-color-schemes: light dark;
+    }
+    </style>
+    <!--[if mso]>
+    <style type="text/css">
+      .f-fallback  {
+        font-family: Arial, sans-serif;
+      }
+    </style>
+  <![endif]-->
+  </head>
+  <body>
+    <table class="email-wrapper" width="100%" cellpadding="0" cellspacing="0" role="presentation">
+      <tr>
+        <td align="center">
+          <table class="email-content" width="100%" cellpadding="0" cellspacing="0" role="presentation">
+            <tr>
+              <td class="email-masthead">
+                <a href="https://hoppscotch.io" class="f-fallback email-masthead_name">
+                Hoppscotch
+              </a>
+              </td>
+            </tr>
+            <!-- Email Body -->
+            <tr>
+              <td class="email-body" width="570" cellpadding="0" cellspacing="0">
+                <table class="email-body_inner" align="center" width="570" cellpadding="0" cellspacing="0" role="presentation">
+                  <!-- Body content -->
+                  <tr>
+                    <td class="content-cell">
+                      <div class="f-fallback">
+
+<h1>Hello,</h1>
+
+<p>We received a request to sign in to Hoppscotch using this email address. If you want to sign in with your {{inviteeEmail}} account, click this link:</p>
+
+
+<table class="body-action" align="center" width="100%" cellpadding="0" cellspacing="0">
+  <tr>
+    <td align="center">
+      <!-- Border based button https://litmus.com/blog/a-guide-to-bulletproof-buttons-in-email-design -->
+      <table width="100%" border="0" cellspacing="0" cellpadding="0">
+        <tr>
+          <td align="center">
+            <table border="0" cellspacing="0" cellpadding="0">
+              <tr>
+                <td>
+                    <a href="{{magicLink}}" class="button button--green" target="_blank">Sign in to Hoppscotch</a>
+                </td>
+              </tr>
+            </table>
+          </td>
+        </tr>
+      </table>
+    </td>
+  </tr>
+</table>
+<p>
+
+
+<p>If you did not request this link, you can safely ignore this email. </p>
+
+<p>Thanks,</p>
+
+<p>Your Hoppscotch team</p>
+
+<table class="body-sub">
+  <tr>
+    <td>
+      <p class="sub">If you’re having trouble with the button above, copy and paste the URL below into your web browser.</p>
+      <p class="sub">{{magicLink}}</p>
+    </td>
+  </tr>
+</table>
+                      </div>
+                    </td>
+                  </tr>
+                </table>
+              </td>
+            </tr>
+            <tr>
+              <td>
+                <table class="email-footer" align="center" width="570" cellpadding="0" cellspacing="0" role="presentation">
+                  <tr>
+                    <td class="content-cell" align="center">
+                      <p class="f-fallback sub align-center">&copy; 2021 Hoppscotch</p>
+                      <p class="f-fallback sub align-center">12 New Fetter Lane, London, United Kingdom, EC4A 1JP.</p>
+                    </td>
+                  </tr>
+                </table>
+              </td>
+            </tr>
+          </table>
+        </td>
+      </tr>
+    </table>
+  </body>
+</html>

packages/hoppscotch-backend/src/mailer/templates/team-invitation.hbs

@@ -0,0 +1,520 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml">
+  <head>
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <meta name="x-apple-disable-message-reformatting" />
+    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
+    <meta name="color-scheme" content="light dark" />
+    <meta name="supported-color-schemes" content="light dark" />
+    <title></title>
+    <!--
+    The style block is collapsed on page load to save you some scrolling.
+    Postmark automatically inlines all CSS properties for maximum email client
+    compatibility. You can just update styles here, and Postmark does the rest.
+  -->
+    <style type="text/css" rel="stylesheet" media="all">
+    /* Base ------------------------------ */
+    
+    @import url("https://fonts.googleapis.com/css?family=Nunito+Sans:400,700&display=swap");
+    body {
+      width: 100% !important;
+      height: 100%;
+      margin: 0;
+      -webkit-text-size-adjust: none;
+    }
+    
+    a {
+      color: #3869D4;
+    }
+    
+    a img {
+      border: none;
+    }
+    
+    td {
+      word-break: break-word;
+    }
+    
+    .preheader {
+      display: none !important;
+      visibility: hidden;
+      mso-hide: all;
+      font-size: 1px;
+      line-height: 1px;
+      max-height: 0;
+      max-width: 0;
+      opacity: 0;
+      overflow: hidden;
+    }
+    /* Type ------------------------------ */
+    
+    body,
+    td,
+    th {
+      font-family: "Nunito Sans", Helvetica, Arial, sans-serif;
+    }
+    
+    h1 {
+      margin-top: 0;
+      color: #333333;
+      font-size: 22px;
+      font-weight: bold;
+      text-align: left;
+    }
+    
+    h2 {
+      margin-top: 0;
+      color: #333333;
+      font-size: 16px;
+      font-weight: bold;
+      text-align: left;
+    }
+    
+    h3 {
+      margin-top: 0;
+      color: #333333;
+      font-size: 14px;
+      font-weight: bold;
+      text-align: left;
+    }
+    
+    td,
+    th {
+      font-size: 16px;
+    }
+    
+    p,
+    ul,
+    ol,
+    blockquote {
+      margin: .4em 0 1.1875em;
+      font-size: 16px;
+      line-height: 1.625;
+    }
+    
+    p.sub {
+      font-size: 13px;
+    }
+    /* Utilities ------------------------------ */
+    
+    .align-right {
+      text-align: right;
+    }
+    
+    .align-left {
+      text-align: left;
+    }
+    
+    .align-center {
+      text-align: center;
+    }
+    /* Buttons ------------------------------ */
+    
+    .button {
+      background-color: #3869D4;
+      border-top: 10px solid #3869D4;
+      border-right: 18px solid #3869D4;
+      border-bottom: 10px solid #3869D4;
+      border-left: 18px solid #3869D4;
+      display: inline-block;
+      color: #FFF;
+      text-decoration: none;
+      border-radius: 3px;
+      box-shadow: 0 2px 3px rgba(0, 0, 0, 0.16);
+      -webkit-text-size-adjust: none;
+      box-sizing: border-box;
+    }
+    
+    .button--green {
+      background-color: #22BC66;
+      border-top: 10px solid #22BC66;
+      border-right: 18px solid #22BC66;
+      border-bottom: 10px solid #22BC66;
+      border-left: 18px solid #22BC66;
+    }
+    
+    .button--red {
+      background-color: #FF6136;
+      border-top: 10px solid #FF6136;
+      border-right: 18px solid #FF6136;
+      border-bottom: 10px solid #FF6136;
+      border-left: 18px solid #FF6136;
+    }
+    
+    @media only screen and (max-width: 500px) {
+      .button {
+        width: 100% !important;
+        text-align: center !important;
+      }
+    }
+    /* Attribute list ------------------------------ */
+    
+    .attributes {
+      margin: 0 0 21px;
+    }
+    
+    .attributes_content {
+      background-color: #F4F4F7;
+      padding: 16px;
+    }
+    
+    .attributes_item {
+      padding: 0;
+    }
+    /* Related Items ------------------------------ */
+    
+    .related {
+      width: 100%;
+      margin: 0;
+      padding: 25px 0 0 0;
+      -premailer-width: 100%;
+      -premailer-cellpadding: 0;
+      -premailer-cellspacing: 0;
+    }
+    
+    .related_item {
+      padding: 10px 0;
+      color: #CBCCCF;
+      font-size: 15px;
+      line-height: 18px;
+    }
+    
+    .related_item-title {
+      display: block;
+      margin: .5em 0 0;
+    }
+    
+    .related_item-thumb {
+      display: block;
+      padding-bottom: 10px;
+    }
+    
+    .related_heading {
+      border-top: 1px solid #CBCCCF;
+      text-align: center;
+      padding: 25px 0 10px;
+    }
+    /* Discount Code ------------------------------ */
+    
+    .discount {
+      width: 100%;
+      margin: 0;
+      padding: 24px;
+      -premailer-width: 100%;
+      -premailer-cellpadding: 0;
+      -premailer-cellspacing: 0;
+      background-color: #F4F4F7;
+      border: 2px dashed #CBCCCF;
+    }
+    
+    .discount_heading {
+      text-align: center;
+    }
+    
+    .discount_body {
+      text-align: center;
+      font-size: 15px;
+    }
+    /* Social Icons ------------------------------ */
+    
+    .social {
+      width: auto;
+    }
+    
+    .social td {
+      padding: 0;
+      width: auto;
+    }
+    
+    .social_icon {
+      height: 20px;
+      margin: 0 8px 10px 8px;
+      padding: 0;
+    }
+    /* Data table ------------------------------ */
+    
+    .purchase {
+      width: 100%;
+      margin: 0;
+      padding: 35px 0;
+      -premailer-width: 100%;
+      -premailer-cellpadding: 0;
+      -premailer-cellspacing: 0;
+    }
+    
+    .purchase_content {
+      width: 100%;
+      margin: 0;
+      padding: 25px 0 0 0;
+      -premailer-width: 100%;
+      -premailer-cellpadding: 0;
+      -premailer-cellspacing: 0;
+    }
+    
+    .purchase_item {
+      padding: 10px 0;
+      color: #51545E;
+      font-size: 15px;
+      line-height: 18px;
+    }
+    
+    .purchase_heading {
+      padding-bottom: 8px;
+      border-bottom: 1px solid #EAEAEC;
+    }
+    
+    .purchase_heading p {
+      margin: 0;
+      color: #85878E;
+      font-size: 12px;
+    }
+    
+    .purchase_footer {
+      padding-top: 15px;
+      border-top: 1px solid #EAEAEC;
+    }
+    
+    .purchase_total {
+      margin: 0;
+      text-align: right;
+      font-weight: bold;
+      color: #333333;
+    }
+    
+    .purchase_total--label {
+      padding: 0 15px 0 0;
+    }
+    
+    body {
+      background-color: #F2F4F6;
+      color: #51545E;
+    }
+    
+    p {
+      color: #51545E;
+    }
+    
+    .email-wrapper {
+      width: 100%;
+      margin: 0;
+      padding: 0;
+      -premailer-width: 100%;
+      -premailer-cellpadding: 0;
+      -premailer-cellspacing: 0;
+      background-color: #F2F4F6;
+    }
+    
+    .email-content {
+      width: 100%;
+      margin: 0;
+      padding: 0;
+      -premailer-width: 100%;
+      -premailer-cellpadding: 0;
+      -premailer-cellspacing: 0;
+    }
+    /* Masthead ----------------------- */
+    
+    .email-masthead {
+      padding: 25px 0;
+      text-align: center;
+    }
+    
+    .email-masthead_logo {
+      width: 94px;
+    }
+    
+    .email-masthead_name {
+      font-size: 16px;
+      font-weight: bold;
+      color: #A8AAAF;
+      text-decoration: none;
+      text-shadow: 0 1px 0 white;
+    }
+    /* Body ------------------------------ */
+    
+    .email-body {
+      width: 100%;
+      margin: 0;
+      padding: 0;
+      -premailer-width: 100%;
+      -premailer-cellpadding: 0;
+      -premailer-cellspacing: 0;
+    }
+    
+    .email-body_inner {
+      width: 570px;
+      margin: 0 auto;
+      padding: 0;
+      -premailer-width: 570px;
+      -premailer-cellpadding: 0;
+      -premailer-cellspacing: 0;
+      background-color: #FFFFFF;
+    }
+    
+    .email-footer {
+      width: 570px;
+      margin: 0 auto;
+      padding: 0;
+      -premailer-width: 570px;
+      -premailer-cellpadding: 0;
+      -premailer-cellspacing: 0;
+      text-align: center;
+    }
+    
+    .email-footer p {
+      color: #A8AAAF;
+    }
+    
+    .body-action {
+      width: 100%;
+      margin: 30px auto;
+      padding: 0;
+      -premailer-width: 100%;
+      -premailer-cellpadding: 0;
+      -premailer-cellspacing: 0;
+      text-align: center;
+    }
+    
+    .body-sub {
+      margin-top: 25px;
+      padding-top: 25px;
+      border-top: 1px solid #EAEAEC;
+    }
+    
+    .content-cell {
+      padding: 45px;
+    }
+    /*Media Queries ------------------------------ */
+    
+    @media only screen and (max-width: 600px) {
+      .email-body_inner,
+      .email-footer {
+        width: 100% !important;
+      }
+    }
+    
+    @media (prefers-color-scheme: dark) {
+      body,
+      .email-body,
+      .email-body_inner,
+      .email-content,
+      .email-wrapper,
+      .email-masthead,
+      .email-footer {
+        background-color: #333333 !important;
+        color: #FFF !important;
+      }
+      p,
+      ul,
+      ol,
+      blockquote,
+      h1,
+      h2,
+      h3,
+      span,
+      .purchase_item {
+        color: #FFF !important;
+      }
+      .attributes_content,
+      .discount {
+        background-color: #222 !important;
+      }
+      .email-masthead_name {
+        text-shadow: none !important;
+      }
+    }
+
+    :root {
+      color-scheme: light dark;
+      supported-color-schemes: light dark;
+    }
+    </style>
+    <!--[if mso]>
+    <style type="text/css">
+      .f-fallback  {
+        font-family: Arial, sans-serif;
+      }
+    </style>
+  <![endif]-->
+  </head>
+  <body>
+    <table class="email-wrapper" width="100%" cellpadding="0" cellspacing="0" role="presentation">
+      <tr>
+        <td align="center">
+          <table class="email-content" width="100%" cellpadding="0" cellspacing="0" role="presentation">
+            <tr>
+              <td class="email-masthead">
+                <a href="https://hoppscotch.io" class="f-fallback email-masthead_name">
+                Hoppscotch
+              </a>
+              </td>
+            </tr>
+            <!-- Email Body -->
+            <tr>
+              <td class="email-body" width="570" cellpadding="0" cellspacing="0">
+                <table class="email-body_inner" align="center" width="570" cellpadding="0" cellspacing="0" role="presentation">
+                  <!-- Body content -->
+                  <tr>
+                    <td class="content-cell">
+                      <div class="f-fallback">
+<h1>Hi there,</h1>
+<p>{{invitee}} with {{invite_team_name}} has invited you to use Hoppscotch to collaborate with them. Click the button below to set up your account and get started:</p>
+<!-- Action -->
+<table class="body-action" align="center" width="100%" cellpadding="0" cellspacing="0">
+  <tr>
+    <td align="center">
+      <!-- Border based button https://litmus.com/blog/a-guide-to-bulletproof-buttons-in-email-design -->
+      <table width="100%" border="0" cellspacing="0" cellpadding="0">
+        <tr>
+          <td align="center">
+            <table border="0" cellspacing="0" cellpadding="0">
+              <tr>
+                <td>
+                  <a href="{{action_url}}" class="button button--green" target="_blank">Join {{invite_team_name}}</a>
+                </td>
+              </tr>
+            </table>
+          </td>
+        </tr>
+      </table>
+    </td>
+  </tr>
+</table>
+<p>
+  Welcome aboard, <br />
+  Your friends at Hoppscotch
+</p>
+<p><strong>P.S.</strong> If you don't associate with {{invitee}} or {{invite_team_name}}, just ignore this email.</p>
+<!-- Sub copy -->
+<table class="body-sub">
+  <tr>
+    <td>
+      <p class="sub">If you’re having trouble with the button above, copy and paste the URL below into your web browser.</p>
+      <p class="sub">{{action_url}}</p>
+    </td>
+  </tr>
+</table>
+                      </div>
+                    </td>
+                  </tr>
+                </table>
+              </td>
+            </tr>
+            <tr>
+              <td>
+                <table class="email-footer" align="center" width="570" cellpadding="0" cellspacing="0" role="presentation">
+                  <tr>
+                    <td class="content-cell" align="center">
+                      <p class="f-fallback sub align-center">&copy; 2021 Hoppscotch</p>
+                      <p class="f-fallback sub align-center">12 New Fetter Lane, London, United Kingdom, EC4A 1JP.</p>
+                    </td>
+                  </tr>
+                </table>
+              </td>
+            </tr>
+          </table>
+        </td>
+      </tr>
+    </table>
+  </body>
+</html>