Relaying Allowed
There are a few cases in which relaying is allowed even though it isn't intended. The most common is case is the use of FEATURE(relay_entire_domain) which allows relaying for every system in class m. If class m is wrong, then the system may open up relaying for other hosts in that domain. Check it with
echo '$=m' | sendmail -bt -d0.4
Friday, February 7
Relaying Denied/Allowed (in sendmail 8.8/8.9-8.12)
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