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From what I understand, what I'm after is called deep header parsing.
Can SmarterMail be made to check all mail servers involved with the delivery of an email against an RBL please. I am finding that a large amount of the spam that we are receiving has actually been relayed to us. I believe that SPAMmers are doing this in several ways:
1) SPAMmers are either using open relay mail servers (less commons now)
2) Creating Gmail, Outlook, Yahoo, or other online webmail provider accounts, and then relaying through them, or
3) They use stolen mail identity credentials from someone and then using those credentials to relay through.
If email servers could check all the email servers in the email header using all the existing SPAM filtering technologies, then I personally believe SPAM filtering could be more effective without a risk false positives. Also, it would make maintaining the RBLs a lot easier, as they would only really need to target the sources, rather than the last email server who sent the message. Country filtering would also be more effective as it could target the source of the message rather than the last email server which is most likely based in USA.
It's still no excuse for good security, but if security fails, then we need smart preventative tools. Checking the email header wouldn't require a new standard to be introduced, just using the existing information more wisely.