Quote:
Originally Posted by mlee
I disabled my spam filters on my personal domain e-mail server and still no e-mail. I know it's being worked and maybe this good info has helped.
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Dropping a message that doesn't have a valid sender domain usually happens before any spam filtering can even take place. When the envelope-from header comes in the domain gets looked up and if it doesn't resolve the connection gets dropped before the remote side can even start to send email.
Postfix does this in most default configurations, for example, since the reject_unknown_sender_domain option defaults to enabled in most distributions. Spam filtering happens after a message has already been accepted for processing, which never happens if you drop the connection before the remote side can even send the message. If you're running Postfix (you probably are, it's the most commonly used mail server these days) you likely have reject_unknown_sender_domain enabled, which is going to cause the email to get dropped whether or not your spam filtering is enabled. Most other mail server software out there has the same default behavior because it's a great way to cut out a lot of spam for very little effort.