SourceThe following set of regular expressions attempt to stop bot spam connections by matching the FQrDNS name of the sending IP against known consumerish rDNS patterns or other rDNS patterns likely to be sources of bot spam and not legit email. This methodology is not without error, but time has proven it to be very accurate. If it blocks a sender you know to be legit and from whom you need to receive mail I recommend whitelisting that source instead of removing an expression below as a means to solve the problem. The expressions are POSIX regular expressions and can be used with either the PCRE or REGEXP table type. The PCRE engine is typically faster.
General eFa discussion
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Has anyone with EFA tried this yet, if so what did you think, Hoe big of a difference did it make??