[MM-54594] Adding new global relay type (#24672)

* adding new global relay type, custom

e2e-tests/playwright/support/server/default_config.ts

@@ -630,6 +630,8 @@ const defaultServerConfig: AdminConfig = {
             SMTPPassword: '',
             EmailAddress: '',
             SMTPServerTimeout: 1800,
+            CustomSMTPServerName: '',
+            CustomSMTPPort: '25',
         },
     },
     JobSettings: {