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Mail Delivery Agents
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1. Set check_recipient_access = hash:/etc/postfix/access.
2. Specify a relaying policy with
smtp_recipient_restrictions, e.g.:
smtpd_recipient restrictions =
permit_mynetworks
hash:/etc/postfix/access
reject_unauth_destination
3. Create /etc/postfix/access (check the access(5) manpage for format/syntax).
4. Run
postmap hash:/etc/postfix/access to convert the file into a database.
Repeat this step after each time you edit /etc/postfix/access.
smtpd_client_restrictions
Use this parameter to block mail from specific senders or originating domains.
Senders to block may be named both specifically, via an external map file such
as the access database, and generally, via values such as the following:
reject_maps_rbl
Enables use of the Real Time Blackhole List described in the “Sendmail” sec-
tion of this chapter; this requires
maps_rbl_domains to be set
reject_unknown_client
Rejects mail from clients whose hostname can’t be determined
See the file /etc/postfix/sample-smtpd.cf for a full list of valid
smtpd_client_
restrictions
settings.
maps_rbl_domains
Specifies one or more Blackhole database providers—e.g., blackholes.mail-abuse.
org.
Mail Delivery Agents
As important as it is to run secure Mail Transfer Agent services, it’s only part of your
email picture, and it isn’t even ...