By default, Google mail server will deny sending email from their servers. To enable additional host/application to send email you must add additional host/application records to the routing email section.

If you try to send an email from your application without setting this up, you will get the following error message: “5.7.1 Invalid credentials for relay“.

1. Go to Google Admin

2. Go to the Advance Settings

Apps -> G Suite -> Settings for Gmail -> Advanced settings

3. Add Additional “SMTP relay service” record to the Routing section.

  • Name: xxxxxxxxx
  • Allowed senders: Any addresses (not recommended)
  • Only accept mail from the specified IP addresses: Yes
  • Allowed IP addresses: xx.xx.xx.xx
  • Require SMTP Authentication: No
  • Require TLS encryption: No

4. After you have add additional “SMTP relay service” record , be sure to save the settings.

Last modified: April 7, 2019



Write a Reply or Comment