I have a qmailtoaster in a quite big LAN. One of the computers in the
LAN is sending spam. How do I find out which host is to blame?
And would someone have an iptables rule that would prevent this (the
server is acting as a NAT gateway as well)? The hosts in the LAN
should be allowed to contact only the ISP's SMTP server. From the
qmailtoaster only email generated from the server itself (for example
from Squirrelmail it is running) should be allowed to be sent further.
Best,
Peter
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