Douglas Campbell wrote: > In any case, spam detectors who rely on "localhost" as the reverse lookup > for an IP address as a condition of passing the e-mail are at risk of > producing false negatives. Reverse lookups fortunately works a bit different: (unless wrongly implemented) 1) IP address (a) -> Hostname 2) Hostname -> IP address (b) 3) Compare IP address a + b -> reject hostname if no match 4) accept hostname As such 'localhost' in step 2 resolves to 127.0.0.1 (or ::1 ;) and the hostname should get rejected, or at least noted, but not used for any security stuff. Greets, Jeroen
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