[Mimedefang] Re: Filtering idea for stock pump&dumps

[Scott Silva]

> FYI, based on what we have confirmed over the past 2 weeks, greylisting
> is causing widespread FPs with Microsoft Exchange 2003 SP2.  In short,
> Microsoft is interpreting 4XX errors as 5XX errors and generating NDRs.
> 
What! A Microsoft program broken? It can't be! The RFC's must be broken!  ;-P

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