My backup mailserver just got totally abused as a relay for spam. I
realize this is my fault for not using all of the spam settings, but I
didn't want to limit my clients. Most of my customers use their email
from dial-up accounts or through a web interface (thanks to MMS) so
their IPs change constantly. How can I use the "Relay for clients only"
option without blocking all of their smtp abilities? How do large ISPs
handle this problem? I am using the "verify return-path" and RBL
servers, but that obviously isn't enough.
Thanks,
Perry
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