Does Microsoft Exchange retry delivery correctly?

Paul Vixie
Sat Sep 16 15:04:45 UTC 2006

> One such server identified itself as `Microsoft ESMTP MAIL Service,
> Version: 6.0.3790.1830' in its SMTP banner, and as `Microsoft Exchange
> V6.5' in the e-mail headers.  Is this a recent version?  I'm wondering
> if a recent change broke the retries.  Does anyone know of a patch or
> a configuration option that corrects this behavior?

microsoft exchange DTRT.  these are probably forged identity headers coming
from a botted host running spamware.

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