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Old 06-17-2010, 11:44 AM   #1
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postfix filter outgoing mail by sender domain


Im trying to get postfix to filter my outgoing mail and basically drop everything that is not in my hash table. So far I managed to get this going

smtpd_sender_restrictions =
        check_sender_access hash:/etc/postfix/sender_domains
and /etc/postfix/sender_domains looks like

Unfortunately those rules also apply to incoming messages. My goal is to disallow users on my host to change their "MAIL FROM" to anything they like and restrict them to domains I specify. I'm aware that the local part still is variable and a user of domain "" could use a email of domain "", but still some of my troubles would be solved if I get this running. Thanks for suggestions

Old 06-17-2010, 01:16 PM   #2
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Hi. You could use smtp authentication. You might find this interesting.
Old 06-18-2010, 03:32 AM   #3
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Originally Posted by Berhanie View Post
Hi. You could use smtp authentication. You might find this interesting.
I do use sasl, but forcing strong passwords on customers is another issue. My latest problem was some guy getting hacked and spam got sent out by his account with forged MAIL FROM's, which is basically what I want to suppress...


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