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<header>SMTP server response on unknown client reject</header> <center><tt>unknown_client_reject_code</tt></center> <hr> This parameter specifies the SMTP server response code when a client without address to name mapping violates the <tt>reject_unknown_clients</tt> restriction rule that is:<br> <i>Access denied: Unknown SMTP client hostname (without DNS A or MX record)</i><br> <br> Note that the postfix default value used for <tt>unknown_client_reject_code</tt> is code 450 also used for other errors. This code in 'standard RFC 822' means 'Requested mail action not taken: mailbox busy or access denied' and ask the sender to try again later (hoping the DNS will answer correctly later).<br> <p> Do not change this unless you have a complete understanding of RFC 822. </p> <hr>