Postfix Overview - Introduction - SCN Research

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smtpd_hard_error_limit
Disconnect after a client has made this number of
errors.
smtpd_junk_command_limit
Limit the number of times a client can issue a junk
command such as NOOP, VRFY, ETRN or RSET in one
SMTP session before it is penalized with tarpit
delays.
UCE control restrictions
smtpd_client_restrictions
Restrict what clients may connect to this mail system.
smtpd_helo_required
Require that clients introduce themselves at the
beginning of an SMTP session.
smtpd_helo_restrictions
Restrict what client hostnames are allowed in HELO
and EHLO commands.
smtpd_sender_restrictions
Restrict what sender addresses are allowed in MAIL
FROM commands.
smtpd_recipient_restrictions
Restrict what recipient addresses are allowed in
RCPT TO commands.
smtpd_etrn_restrictions
Restrict what domain names can be used in ETRN commands,
and what clients may issue ETRN commands.
allow_untrusted_routing
Allow untrusted clients to specify addresses with
sender-specified routing. Enabling this opens up
nasty relay loopholes involving trusted backup MX
hosts.
smtpd_restriction_classes
Declares the name of zero or more parameters that
contain a list of UCE restrictions. The names of
these parameters can then be used instead of the
restriction lists that they represent.
maps_rbl_domains
List of DNS domains that publish the addresses of
blacklisted hosts.
relay_domains
Restrict what domains or networks this mail system
will relay mail from or to.
UCE control responses
access_map_reject_code
Server response when a client violates an access
database restriction.
invalid_hostname_reject_code
Server response when a client violates the
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6/26/01