Rule 1:
We check the validity of the sending email address. If it is spoofed, we reject the message.
Rule 2:
We check incoming mail against several spam lists. If the message originated from an IP address included in one of the spam lists, we place a spam warning in the message header, like this:
X-DUL-Warning: 207.182.139.148 is in blacklist sbl.spamhaus.org
Therefore, you can now easily implement a mail filter to reject messages that contain the spam warning by checking all incoming messages for the string: X-DUL-Warning in the message header.
We do not automatically discard suspected spam messages because as great a tool as spam lists are, they may ocasionally block legitimate mail. Therefore, we provide the necessary spam filtering tools and let the account owner decide whether to use them or not.
You can find spam Assassin in your cpanel and configure it accordingly.
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