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<header>SMTP server response on fqdn violation</header> <center><tt>non_fqdn_reject_code</tt></center> <hr> This parameter specifies the SMTP server response code when a mail violates the <tt>reject_non_fqdn_hostname</tt> or <tt>reject_non_fqdn_sender</tt> or <tt>reject_non_fqdn_recipient</tt> rule that are:<br> <i>Access denied: Invalid domain for client HELO hostname, sender or recipient email address (not FQDN)</i><br> <br> Note that the postfix default value used for <tt>non_fqdn_reject_code</tt> is code 504, and this code in 'standard RFC 822' should means 'Command parameter not implemented'. So with Postfix, a <tt>non_fqdn_reject_code</tt> rule violation does not reflect exactly the RFC822 explanation of reported code.<br> <p> To avoid confusion, you can change this to 578 for example, otherwise, do not change this unless you have a complete understanding of RFC 822. </p> <hr>