diff --git a/packages/hoppscotch-backend/src/infra-config/infra-config.service.ts b/packages/hoppscotch-backend/src/infra-config/infra-config.service.ts
index b65e5aefe..ddd0f55c1 100644
--- a/packages/hoppscotch-backend/src/infra-config/infra-config.service.ts
+++ b/packages/hoppscotch-backend/src/infra-config/infra-config.service.ts
@@ -16,7 +16,7 @@ import {
   INFRA_CONFIG_RESET_FAILED,
   INFRA_CONFIG_UPDATE_FAILED,
 } from 'src/errors';
-import { throwErr, validateUrl } from 'src/utils';
+import { throwErr, validateSMTPUrl } from 'src/utils';
 import { ConfigService } from '@nestjs/config';
 import { AuthProviderStatus, stopApp } from './helper';
 import { EnableAndDisableSSOArgs, InfraConfigArgs } from './input-args';
@@ -302,7 +302,7 @@ export class InfraConfigService implements OnModuleInit {
   ) {
     for (let i = 0; i < infraConfigs.length; i++) {
       if (infraConfigs[i].name === InfraConfigEnumForClient.MAILER_SMTP_URL) {
-        const isValidUrl = validateUrl(infraConfigs[i].value);
+        const isValidUrl = validateSMTPUrl(infraConfigs[i].value);
         if (!isValidUrl) return E.left(INFRA_CONFIG_INVALID_INPUT);
       }
     }
diff --git a/packages/hoppscotch-backend/src/utils.ts b/packages/hoppscotch-backend/src/utils.ts
index 346e4b214..cc74c30f2 100644
--- a/packages/hoppscotch-backend/src/utils.ts
+++ b/packages/hoppscotch-backend/src/utils.ts
@@ -136,33 +136,18 @@ export const validateEmail = (email: string) => {
  * @param url The URL to validate
  * @returns boolean
  */
-export const validateUrl = (url: string) => {
-  /**
-   * RegExps.
-   * A URL must match #1 and then at least one of #2/#3.
-   * Use two levels of REs to avoid REDOS.
-   */
-  const protocolAndDomainRE = /^(?:\w+:)?\/\/(\S+)$/;
-  const localhostDomainRE = /^localhost[\:?\d]*(?:[^\:?\d]\S*)?$/;
-  const nonLocalhostDomainRE = /^[^\s\.]+\.\S{2,}$/;
+export const validateSMTPUrl = (url: string) => {
+  // Possible valid formats
+  // smtp(s)://mail.example.com
+  // smtp(s)://user:pass@mail.example.com
+  // smtp(s)://mail.example.com:587
+  // smtp(s)://user:pass@mail.example.com:587
 
-  const match = url.match(protocolAndDomainRE);
-  if (!match) {
-    return false;
-  }
-
-  const everythingAfterProtocol = match[1];
-  if (!everythingAfterProtocol) {
-    return false;
-  }
-
-  if (
-    localhostDomainRE.test(everythingAfterProtocol) ||
-    nonLocalhostDomainRE.test(everythingAfterProtocol)
-  ) {
-    return true;
-  }
+  if (!url || url.length === 0) return false;
 
+  const regex =
+    /^(smtp|smtps):\/\/(?:([^:]+):([^@]+)@)?((?!\.)[^:]+)(?::(\d+))?$/;
+  if (regex.test(url)) return true;
   return false;
 };