Perhaps I am trying to do the impossible.
centos6, spamassassin, procmail, dovecot, postfix.
Postfix, by default, accepts all incoming mail to any user listed in the
shadow/passwd and alias files.
I cannot find a way to stop that without manually blocking each non
wanted user (like nobody, apache) without killing local delivery.
For most of the users listed in those files, who cares. However for one,
root, this is a massive issue.
Root gets a lot of mail from errors on the system. Preventing local
delivery (or through the alias file, delivery through root to another
user) makes root never receive those important mails.
Not preventing root from incoming mails means root@xxxxxxxxxxx can be
slammed with spam.
Local and external mail all seem to go through all of the programs
(postfix, procmail, spamassassin, dovecot).
Local delivery of mails is needed for root.
What I would like is to just tell postfix to only allow incoming mail
for user1 and user2 and reject all...but only from external sources, not
locally sent mail.
Postfix does seem to allow you to limit who can send mail out of the
server though...
I have 2 books on postfix here and spent many days online but I do not
see the solution short of /dev/null or reject of all mail, local or
external, of root.
perplexed.
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