wehub-resource-sync
42 lines
1.6 KiB
HTML
42 lines
1.6 KiB
HTML
<header>Restrictions on sends in HELO commands</header>
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<center><tt>smtpd_helo_restrictions</tt></center>
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<hr>
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This parameter specifies optional restrictions on what SMTP clients can send in
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SMTP HELO and EHLO commands.
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<p>
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The default is to permit everything. The following restrictions
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are available:
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<ul>
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<li> <tt>permit_mynetworks:</tt> permit if the client address matches
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<a href=opt_mynetworks><tt>$mynetworks</tt></a>.
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<li> <tt>reject_unknown_client:</tt> reject the request if the client hostname is unknown.
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<li> <tt>reject_maps_rbl:</tt> reject if the client is listed under
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<a href=opt_maps_rbl_domains><tt>$maps_rbl_domains</tt></a>.
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<li> <tt>reject_invalid_hostname:</tt> reject HELO hostname with bad syntax.
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<li> <tt>reject_unknown_hostname:</tt> reject HELO hostname without DNS A or MX record.
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<li> <tt>reject_non_fqdn_hostname:</tt> reject HELO hostname that is not in FQDN form
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<li> <tt>check_helo_access maptype:mapname:</tt> look up HELO hostname or parent domains.
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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>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>reject:</tt> reject the request. Place this at the end of a restriction.
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<li> <tt>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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