The behavior of the
flush(8) daemon is controlled by parameters
in the main.cf configuration file.
By default, Postfix "fast ETRN" service is available only for
destinations that Postfix is willing to relay mail to:
/etc/postfix/main.cf:
fast_flush_domains = $
relay_domains
smtpd_etrn_restrictions =
permit_mynetworks, reject
Notes:
-
The
relay_domains parameter specifies what destinations
Postfix will relay to. For destinations that are not eligible for
the "fast ETRN" service, Postfix replies with an error message.
-
The
smtpd_etrn_restrictions parameter limits what clients
may execute the ETRN command. By default, any client has permission.
To enable "fast ETRN" for some other destination, specify:
/etc/postfix/main.cf:
fast_flush_domains = $
relay_domains, some.other.domain
To disable "fast ETRN", so that Postfix rejects all ETRN requests
and so that it maintains no per-destination logfiles, specify:
/etc/postfix/main.cf:
fast_flush_domains =
