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Article ID6
Created On8/15/2010
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Mac OS X 10.6 Mail Configuration

Two options that are not set by the Mac Mail GUI that need to be configured to send/receive mail.  Otherwise you will receive the following error messages:

The message could not be sent because one of the receipients was rejected by the server. The rejected email address was "recipient@example.com" is subject "example", account: "mail.example.com" , server "mail.example.com", protocol: SMTP, server response: "504 5.5.2 < hostname > : Helo command rejected: need fully qualified host name", port: 25, secure (SSL): no, server error: 504, error number: 0x800CCC79.

Of course Apple says this is a MS Outlook client issue,  the solution is as follows provided by the Apple knowledgebase at http://support.apple.com/kb/TS3023

  1. In /etc/postfix/main.cf, locate the smtp_client_restrictions setting
  2. Remove "reject_non_fqdn_hostnam"' from the list of settings.
  3. Restart the Mail service.

Second Error:

Oct 20 15:20:33 xserve postfix/smtp2667: 02FDB10AB29: to=<******@******.***>, relay=none, delay=1, delays=0.82/0.1/0.07/0, dsn=5.4.6, status=bounced (mail for ******.com loops back to myself)

To resolve this issue edit the /etc/postfix.main.cf file and add your domain name to the mydestination line. 

See example below:
mydestination = $myhostname,localhost.$mydomain,localhost,yourdomain.com

Once complete save the change and restart the mail service