> has you set 'MSGIDpreTag' and 'MSGIDSec' ?
> 
> Both have to be set! The default value is NOT valid for  'MSGIDSec'!

good point; also, if the customer is also *sending* out emails through
ASSP, it may be a good idea enabling the outbound rate limiter, that is
setting appropriate values for LocalFrequencyInt/LocalFrequencyNumRcpt
(and possibly for NoLocalFrequency *or* LocalFrequencyOnly not both);
in my experience the limiter greatly helps finding sudden "outbound
emails flurries" which are often caused by compromised boxes (or either
by regular users thinking that mass-mailing is cool :P)

For a starter, you may try setting up the following

LocalFrequencyInt := 1800

LocalFrequencyNumRcpt := 120

then populate EITHER the NoLocalFrequency or LocalFrequencyOnly with
something like file:files/nolocalfreq.txt of file:files/localfreq.txt
and edit the file populating it with the desired recipients; I use the
first one and populated the file with addresses beloning to mailing
lists or newsletter, but if you prefer you may use the second one and
just insert into it the sender addresses which you want to "monitor";
in either case, you'll then get back an alert in case someone sends out
more than 120 messages in 1800 seconds (you may fine tune those values,
but they are usually a good starting point)

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