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I have a Google Apps Gmail as subject, I success sent email to smartermail email account by using gmail, yahoo, hotmail, facebook, foxmail (qq)... and smartermail email account the email...

Only Google Apps GMAIL reject, message as below, then I check logs in smartermail mail server, I didn't see got email from Google Apps GMAIL, why???

Delivery to the following recipient failed permanently:

 user@domain.com

Technical details of permanent failure:

Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 550 550 Authentication is required for relay (state 12).

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