Declude MAILFROM test check only the domain on the MAILFROM address But we recive a lot of SPAM with mailfrom like this. <[EMAIL PROTECTED]> since hotmail.com is a valid Domain, then the message pass the test
Is there a test like the "Mailfrom" of Imail that test that the user really exists on the remote server ??
No. The problem is that such a test is very resource intensive -- specifically, it will use about 10 times as much bandwidth as the MAILFROM test, and will often have false negatives (E-mail addresses that do not exist, but pass the test), and occasional false positives (E-mail addresses that do exist, but fail the test). Also, it will delay the delivery of the E-mail by anywhere from several seconds to a minute or so (lots of mailservers take a long time to respond to commands), as there are about 8 round trips that need to be made rather than just 1 -- and those round trips also require more effort on the remote end.
Then, imagine if a spammer joe jobs you, using your E-mail address as the return address. If everyone plays this game, then your mailserver is going to receive thousands to millions of hits in a very short period of time, causing a DDoS attack on your server.
So I'm not a big fan of this type of test.
-Scott
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