Exim
From DWIKI
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HOWTO
Understand exim logs
FAQ
Find logins in log
grep "A=login" /var/log/exim/mainlog
hostname --fqdn did not return a fully qualified name
fix /etc/hosts etc, but if hostname -f/--fqdn fails, run hostname mail.example.com and save yourself a lot of headache
Helo command rejected: need fully-qualified hostname
Make sure your FQDN/IP are ok in /etc/hosts
Message is frozen
Mail can't be delivered locally, check storage.
all relevant MX records point to non-existent hosts
This may mean the MX IP is a private one, in that case remove that IP/network from ignore_target_hosts
Show queue
exim -bp
Show body of message in queue
exim -Mvb 1gKM2x-0004ti-Lj
remove frozen from queue
exim -bp|grep frozen|awk '{print $3}' |xargs exim -Mrm
