RFC 2821 states that the helo/ehlo salutation contain a fqdn or a
domain literal. I see lots of bots using the home computer's name
link bob or some sort of provisioning ID like AM23g6d so since valid
helos must have a period in them and since many co-oped home
computers just have names how about adding fast test such as:
if ( $_ !~ /\./ ) { reject }
Tom
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