Dennis Peterson wrote:
>> What is the advantage of using clamav-milter or is it necessary?
> I've not found any particular advantage. I use J-Chkmail as a Sendmail
> milter for spam and it invokes clamd for attachments.
I think the OP was asking for advantage of milter vs. non-milter. The two
approaches differ as follows:
Milter: You can make decisions during the SMTP transaction.
PROS:
- You can reject mail without generating backscatter
- You can more easily make other kinds of tests (like greylisting)
CONS:
- If your server is overloaded, mail can tempfail. There are hard time
constraints with filtering during SMTP.
Mailscanner approach: Filtering is done after the SMTP session is over.
PROS:
- Handles spikes in load better. Mail just queues up a bit until the machine
can deal with it.
CONS:
- If you reject a message, you either have to silently discard it or risk
generating backscatter.
- You can't do tests that rely on characteristics of SMTP (like greylisting)
If *all* you are doing is throwing away viruses, either approach is probably
fine. If you want more flexibility, Milter starts looking more attractive.
Regards,
David.
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