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