How to Remove X-headers

Alex Broens ms-list at
Fri Mar 13 21:51:18 GMT 2009

On 3/13/2009 10:29 PM, Hugo van der Kooij wrote:
> Hash: SHA1
> Randal, Phil wrote:
>> We've hit the same issue this week.
>> The relevant Microsoft documentation is here:
>> Understanding the Impact of Named Property and Replica Identifier Limits
>> on Exchange Databases
>> Events 9666, 9667, 9668, and 9669 Received When Named Properties or
>> Replica Identifiers Are Depleted for An Exchange Database
>> Note how Microsoft has completely lost the plot on this one, and fails
>> to understand that there could be any number of unique X- header lines,
>> not just their arbitrary limit of at most 327766 "Named properties".
> So if I start adding randomness to my headers and send out enough email
> to an exchange server I will get the Exchange admin into a tight spot?
> I must say I almost feel tempted to install just such a scheme to hit on
> Microsoft admins worldwide ;-)

hey, no need to go thru such trouble....

consider how many of these are silently doing it for you, nice and 
slowly. till at one point, 10 mails will DOS a box.
Botnets attacks are peanuts compared to this.

lets start counting:

ESP's tracking & X-Mail headers.
Antispam devices adding huge header sets
MUA headers
MailScanner Organisation/etc unique headers
Devices using Spamassassin with modified header sets
BATV type implementations

there sooooooo many out there at some point there'll be global panic 
hitting Microsoft related forums/lists.

Honestly, dunno if one should start sending out advisories to clients to 
  prepare for the big bang, or does M$ ack and promise to provide a fix?


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