Tcpwrappers, sendmail, and unknown hosts...

Kevin Kinsey kdk at
Sat Oct 10 17:42:13 UTC 2009

Seems like a lot of the spam we fight comes from
hosts with no DNS entries.  What about using this?


$grep sendmail /etc/hosts.allow

sendmail : KNOWN : allow
sendmail : UNKNOWN : deny


Comments?  anyone tried it?

Kevin Kinsey
DaleCo, S.P.

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