[Mimedefang] Spam with more than one recipient - reject or not?

Matthew.van.Eerde at hbinc.com Matthew.van.Eerde at hbinc.com
Wed Aug 17 11:58:43 EDT 2005

Les Mikesell wrote:
> On Wed, 2005-08-17 at 03:26, Michal Jankowski wrote:
>> I have received a suggestion to stream by recipient.
>> But that's a big no-no. Once you do that, you have effectively
>> accepted the smtp transaction. So you cannot 'bounce' and the only
>> way to notify sender is by mail, which should be avoided at all cost.
> This is the same situation you have if a forwarding relay is
> involved and one or more almost certainly already is for all
> real non-local mail.  If a sender is really going to be notified,
> a bounce message has to be constructed and mailed whether you
> do it or the previous relay does it.

This depends entirely on your local mail topology.  If MIMEDefang is running on your MX hosts, there is a real social cost associated with stream-by-recipient.  If MIMEDefang is running on an internal SMTP hub, then you've already accepted the mail anyway at your perimeter servers, and that cost goes away.

Matthew.van.Eerde (at) hbinc.com               805.964.4554 x902
Hispanic Business Inc./HireDiversity.com       Software Engineer

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