On 4 Oct 2019, at 21:33, @lbutlr wrote:
How would I go about blocking mail to a valid address if it is sent
from a user on my postfix mail server.
For example, let’s say I have [email protected] and that address
is only for people outside to send mail to, so when a local user or a
user in virtual. (Those users have to use submission ports 587 or 465)
send a mail to that address, I would like it to be rejected with a
message like "REJECT This email not for internal use".
A check_recipient_access map that is only used for the in the
submission/smtps services would do the trick. i.e. add an additional
override in master.cf like "-o
smtpd_recipient_restrictions=[...],check_recipient_access
hash:/etc/postfix/remote_only,[...]"
And is the answer different if example.com is on a different server
but I still don’t want users on this mail server so be able to send
email to it?
Nope.
How about if there is a specific list of users who are not allowed to
send mail to that email address?
Use a restriction class: see the RESTRICTION_CLASS_README. That would
also work for the simpler case if you don't want to fiddle in master.cf.
--
Bill Cole
[email protected] or [email protected]
(AKA @grumpybozo and many *@billmail.scconsult.com addresses)
