Re: [Exim] Attachments and bounce messages

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著者: Philip Hazel
日付:  
To: Sheldon Hearn
CC: exim-users
題目: Re: [Exim] Attachments and bounce messages
On Fri, 5 Sep 2003, Sheldon Hearn wrote:

> Since viruses should be rejected at SMTP time, I can't think of a
> situation where Exim would accept an infected message, then fail to
> deliver it and have to send a bounce.
>
> Could you explain the context in which this problem surfaces?


Simple. A virus that *isn't* rejected at SMTP time! Not everybody has
got virus scanning enabled.

[In fact, we were in the process of cautiously rolling out virus
scanning on our central servers, gradually putting more and more load
through the scanner - so as not to overload it - when Sobig.F struck.
As it happened, my email wasn't going through the scanner at that point.
In the first 2 days my personal filter rejected 40,000 messages (but
discarded them, not bounced them). The full load was hastily dumped on
the scanner. It coped, fortunately. Since then I've been /dev/null-ing
about 1500 collaterals a day. Sigh.]

--
Philip Hazel            University of Cambridge Computing Service,
ph10@???      Cambridge, England. Phone: +44 1223 334714.