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Is there a way to block a local/unix user (or a list of local users) from sending mails via mail command (or maybe even in postfix, which is the MTA I have).

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2  
You probably want to take a look at Postfix restriction classes. –  Karol Babioch Mar 19 at 23:27
    
@KarolBabioch Ok, I did the following and yet I'm still able to send with the local unix user "gitolite": pastebin.com/bN46U7mr I also restarted postfix. What is wrong? –  alexandernst Mar 19 at 23:56
    
@KarolBabioch btw, just realized that there is a missing comma after the hash:<path> line. I fixed that but it's still not working. And by "not working" I mean I can "su gitolite" and then "mail -s Test [email protected]" and the mail gets to the queue. –  alexandernst Mar 20 at 0:02
    
Can you paste the loglines generated by postfix after the mail command is run? –  clement Mar 20 at 6:06
    
Ah, your comment actually lead me to the solution :) I forgot to generate the .db file with postmap. Thank you! –  alexandernst Mar 20 at 10:01

1 Answer 1

up vote 1 down vote

As suggested by @Gilles, I'm leaving here what I did so others can benefit from it.

My machine's host is abcxyz.ovh.net and the user I was trying to block was foobar.

I ended up creating /etc/postfix/sender_access with the following content:

[email protected] REJECT

Then I compiled it with postmap /etc/postfix/sender_access.

Finally, I added this to my Postfix configuration:

smtpd_recipient_restrictions =
 check_sender_access hash:/etc/postfix/sender_access,
 ...,
 ...,
 ...,
 ...
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