Edgaras Luko?evi?ius:
> All this is done to put users into our own "classes" (eg. spammers vs.
> non-spammers). Because there are clean and dirty IP pools and if we see
> that user *may be* abusing email (or any other) system we want to put
> them to "dirty" pool for some time. While this works with ordinary
> senders, it does not for aliases and spammers are abusing that (we have
> a few IP addresses blacklisted by gmail, yahoo, hotmail because of this).
>
> And we do use other means to fight spammers (sender rate, policyd,
> quotas, RBLs, FBL, etc., etc.), but that is not enough. Classifying
> users to groups already improved quality of our email services and we
> would like to improve it further.
You can override the envelope sender with the owner of the alias,
but that feature exists only for alias_maps, not virtual_alias_maps.
/etc/aliases:
# username is a local(8) username.
username: u...@hotmail.com
owner-username: username@your.domain.example
/etc/postfix/main.cf:
# Override the sender with username@your.domain.example
expand_owner_alias=yes
Of course that totally breaks forwarding by ordinaty users and
introduces a possibility for mail delivery errors as they come back
to you.
Wietse
