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:
Technical details of permanent failure: