New answers tagged spam-filter
The best way to tighten the Exchange ship is by hiding it behind a secure and reliable MTA that does the filtering. As Wesley stated, one option that is quite popular is using a commercial filtering appliance. If you're a do-it-yourselfer, have a look at an MTA with excellent "baked in" filtering such as Haraka. You'd use the rcpt_to.in_host_list plugin to ...
From this research paper on SNARE, I present this nugget: For ham, 90% of the messages travel about 4,000 km or less. On the other hand, for spam, only 28% of messages stay within this range. My personal observations mirror yours and note that even now in 2014, geographic location continues to be an excellent predictor of spam. As others pointed out, ...
Any information about email rejected due to a response from a blacklist server will be included in the log file corresponding to your email server. This is primarily to assist the mail server administrator when they need to determine the cause(s) for non-delivery.
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