OTRS is able to send automatically email replay. So it's possibe to create an email loop (of course we check bulk headers but other some strange systems not!).
Example 7-5. Kernel/Config.pm - PostmasterMaxEmails
[...]
# PostmasterMaxEmails
# (Max post master daemon email to own email-address a day.
# Loop-Protection!) [default: 40]
$Self->{PostmasterMaxEmails} = 40;
[...] |