In my experience I find that the culprits are restricted to one or two remote servers. I have written a mailet that logs a summary of every email's size and remote host to the database. When I notice smtp bandwidth is high, I consult this log to find the likely source. I can then block the responsible hosts at the firewall level.
-craig
Lahu wrote:
Hi, Is there a way to block/reject AND MOST IMPORTANTLY prevent over-sized emails from being downloaded AT ALL to the company mail-server.
The current "SizeGreaterThan" mailet does this only after downloading the emails first and then analysing/evaluatiing etc. In my case, I dont want the email/attachment/message/etc. to be downloaded at all.
If not, then wat is the workaround ? Coz, without this, it is possible for anybody to bombard the mail server wid heavy mails such as 5 MB and do a DOS attack on us??
I m very concerned about this.
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