I'm trying to set up my mail server so it blocks emails that appears to come from the same address that they are going to. i.e. From: u...@example.com To: u...@example.com
I figured a good way to do this would be with the reject_sender_login_mismatch which, according to the docs, not only prevents the above case, but can also avoid any other bogus from addresses from outside my network: http://www.postfix.org/uce.html#smtpd_sender_restrictions reject_sender_login_mismatch Reject the request when $smtpd_sender_owner_maps specifies an owner for the MAIL FROM address, but the client is not (SASL) logged in as that MAIL FROM address owner; or when the client is (SASL) logged in, but the client login name doesn't own the MAIL FROM address according to $smtpd_sender_login_maps. Unfortunately, it doesn't seem to work as described. The smtpd_sender_owner_maps setting doesn't seem to do anything. Setting it doesn't cause an error, so it seems like it's a valid option. If I set smtpd_sender_login_maps instead, it *does* do something, but it applies to non-SASL authenticated clients, which is contrary to what the doc says. I managed to get it working in a way that seems to do what I need, but the mismatch between the docs and the behavior makes me a bit uneasy. Is there something I'm missing? eric
