On Thu, Jun 17, 2004 at 07:28:45AM -0400, David F. Skoll quoth: > On Wed, 16 Jun 2004, R Armiento wrote: > > > However, 'C':s spam filter silently drops the email. > > In my opinion, any spam filter that silently drops e-mail is broken, and > is indeed a security risk. A spam filter MUST respond with a 500 SMTP > failure code if it rejects a message. A 4xx response code should also be acceptable in some cases (for example, if an email is being rejected because the return address domain doesn't resolve: which can only be treated as a temporary error). The point is that the sender MUST eventually find out the mail didn't get to it's intended recipient. ~Kyle -- The average Ph.D thesis is nothing but the transference of bones from one graveyard to another. -- J. Frank Dobie, "A Texan in England"
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