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<header>SMTP server response on domain reject</header> <center><tt>unknown_address_reject_code</tt></center> <hr> This parameter specifies the SMTP server response code when a client violates the <tt>reject_unknown_sender_domain</tt> or <tt>reject_unknown_recipient_domain</tt> restriction rules that are:<br> <i>Access denied: Unknown domain for sender or recipient email address (without DNS A or MX record)</i><br> <br> Note that the postfix default value used for <tt>unknown_address_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>