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Troubleshooting: SMTP relay service setting

If you receive any of the following SMTP relay service error messages, click the message for a description of the error. Mail relay denied
  • Email is being sent from a domain or IP that isn’t registered in G Suite. Please sign in to your G Suite account and verify that your sending device IP is registered within G Suite SMTP relay service settings. See SMTP Relay service setting for more information.
  • The domain with the configured policy couldn't be properly identified. Please ensure that the sending client uses an appropriate value for both the HELO command; ideally, the fully qualified domain name (FQDN) of the sending device, and that the SMTP sender (MAIL FROM:) identifies the send address properly (MAIL FROM: <user@example.com>). 
Invalid credentials for relay

The IP address you registered in the G Suite SMTP relay service setting doesn’t match domain of the account this email is being sent from. If you are trying to relay mail from a domain that isn’t registered in your Googles Apps account, you must configure your mail server either to use SMTP AUTH to identify the sending domain or to present one of your domain names in the HELO or EHLO command. See SMTP Relay service setting for more information.

Daily SMTP relay limit exceeded for customer

The customer has reached its daily SMTP relay limit. See SMTP Relay service setting for SMTP relay sending limits, or contact your administrator for additional help.

Peak SMTP relay limit exceeded for customer

This is a temporary error. The customer has exceeded its peak SMTP relay limit, and relay mail for the customer is temporarily being deferred. See SMTP Relay service setting for SMTP relay sending limits.

Daily SMTP relay limit exceeded for user

The user has reached their daily SMTP relay limit. See SMTP Relay service setting for SMTP relay sending limits, or contact your administrator for additional help.

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