Len Conrad:
> is this param server-wide, or can it be present in smtpd_*_restrictions ?
Use this in smtpd_mumble_restrictions:
reject_unlisted_sender
Reject the request when the MAIL FROM address is not listed in
the list of valid recipients for its domain class. See the
smtpd_reject_unlisted_sender parameter description for details.
This feature is available in Postfix 2.1 and later.
Use this as a main.cf name=value setting, or as "-o name=value"
override in master.cf:
smtpd_reject_unlisted_sender (default: no)
Request that the Postfix SMTP server rejects mail from unknown
sender addresses, even when no explicit reject_unlisted_sender
access restriction is specified. This can slow down an explosion
of forged mail from worms or viruses.
Wietse
