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 - MaxPostMasterEmails
[...]
# MaxPostMasterEmails
# (Max post master daemon email to own email-address a day.
# Loop-Protection!)
$Self->{MaxPostMasterEmails} = 20;
[...] |