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46 lines
2.1 KiB
HTML
46 lines
2.1 KiB
HTML
<header>Restrictions on sender addresses</header>
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<center><tt translate="no">smtpd_sender_restrictions</tt></center>
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<hr>
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This parameter specifies optional restrictions on sender addresses that SMTP
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clients can send in MAIL FROM commands.
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<p>
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The default is to permit any sender address. The following
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restrictions are available:
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<ul>
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<li><tt translate="no">permit_mynetworks:</tt> permit if the client address matches
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<a href=opt_mynetworks><tt translate="no">$mynetworks</tt></a>.
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<li><tt translate="no">reject_unknown_client:</tt> reject the request if the client hostname is unknown.
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<li><tt translate="no">reject_maps_rbl:</tt> reject if the client is listed under
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<a href=opt_maps_rbl_domains><tt translate="no">$maps_rbl_domains</tt></a>.
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<li><tt translate="no">reject_invalid_hostname:</tt> reject HELO hostname with bad syntax.
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<li><tt translate="no">reject_unknown_hostname:</tt> reject HELO hostname without DNS A or MX record.
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<li><tt translate="no">reject_unknown_sender_domain:</tt> reject sender domain without A or MX record.
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<li><tt translate="no">check_sender_access maptype:mapname:</tt> look up sender address, parent domain, or localpart@.
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Reject if result is REJECT or "[45]xx text"
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Permit otherwise.
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<li><tt translate="no">check_client_access maptype:mapname:</tt> see
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<a href=opt_smtpd_client_restrictions>smtpd_client_restrictions</a>.
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<li><tt translate="no">check_helo_access maptype:mapname:</tt> see
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<a href=opt_smtpd_helo_restrictions>smtpd_helo_restrictions</a>.
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<li><tt translate="no">reject_non_fqdn_hostname:</tt> reject HELO hostname that is not in FQDN form
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<li><tt translate="no">reject_non_fqdn_sender:</tt> reject sender address that is not in FQDN form
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<li><tt translate="no">reject:</tt> reject the request. Place this at the end of a restriction.
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<li><tt translate="no">permit:</tt> permit the request. Place this at the end of a restriction.
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</ul>
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Restrictions are applied in the order as specified; the first
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restriction that matches wins.
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<p>
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Specify a list of restrictions, separated by commas and/or whitespace.
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Continue long lines by starting the next line with whitespace.
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<hr>
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