D. Karapiperis a écrit :
> Hi All
>
> I have a question regarding postfix restrictions.
>
> Is there a way for Postfix to enforce some kind of policy so that all
> the outgoing (allowed) mails be " @business.com" and all the others be
> rejected.
> Of course this policy should be enforced only to the outgoing emails
> not in the incoming.
>
you can do the following: if the sender is not *...@example.com, then do
not allow relay.
smtpd_sender_restrictions =
check_sender_access hash:/etc/postfix/outbound_sender
reject_unauth_destination
== outbound_sender
example.com OK
users will still be able to use any sender adress if they send to one of
your domains (mydestination, virtual mailbox domains, relay domains,
virtual alias domains).
> I think that smtpd_*_restricions regard all the e-mails
> (outgoing,incoming) and simply check the RCPT TO and MAIL FROM
> statements. Correct?
all mail is incoming when received and outgoing when forwarded!
if the above isn't enough, you could do one or more of the following things:
- if mail comes from mynetworks, require that the sender address is
*...@example.com. you can do this with a restriction class based on
check_client_access.
- for authenticated mail, require that the sender matches the login
(look for reject_sender_login_mismatch and friends).
... etc.
