[ExchangeList] Re: Drop emails

  • From: "John T \(Lists\)" <johnlist@xxxxxxxxxxxxxxxxxxx>
  • To: <exchangelist@xxxxxxxxxxxxx>
  • Date: Fri, 12 May 2006 15:26:33 -0700

Your thought process is old and no long valid. There have been quite a
number of viruses and spam campaigns in the last year that do not care about
valid or invalid recipient. They try to force as much as possible. In this
sense, part of the intent is to overwhelm and create a sort of DOS attack on
the receive system. The sheer volume of messages in those kinds of campaigns
far outweigh the obscurity of accepting all then dropping invalid. 

 

John T

eServices For You

 

"Seek, and ye shall find!"

 

-----Original Message-----
From: exchangelist-bounce@xxxxxxxxxxxxx
[mailto:exchangelist-bounce@xxxxxxxxxxxxx] On Behalf Of
ChongJa@xxxxxxxxxxxxxxxx
Sent: Friday, May 12, 2006 12:57 PM
To: exchangelist@xxxxxxxxxxxxx
Subject: [ExchangeList] Re: Drop emails

 

Some AV filters will accept all emails for invalid accounts, that way
someone attempting to perform a DHA attack cannot determine valid accounts.
You can enable recipient filtering but this in itself is susceptible to DHA
attacks because the SMTP connection will drop if you specify an invalid
account telling you user does not exist or something to that effect.

 

  _____  

From: exchangelist-bounce@xxxxxxxxxxxxx
[mailto:exchangelist-bounce@xxxxxxxxxxxxx] On Behalf Of John T (Lists)
Sent: Friday, May 12, 2006 3:47 PM
To: exchangelist@xxxxxxxxxxxxx
Subject: [ExchangeList] Re: Drop emails

But the question that begs to be asked is why do you want to accept e-mail
for invalid accounts in the first place?

 

John T

eServices For You

 

"Seek, and ye shall find!"

 

-----Original Message-----
From: exchangelist-bounce@xxxxxxxxxxxxx
[mailto:exchangelist-bounce@xxxxxxxxxxxxx] On Behalf Of Bruce J. Rose
Sent: Friday, May 12, 2006 10:33 AM
To: exchangelist@xxxxxxxxxxxxx
Subject: [ExchangeList] Drop emails

 

Is it possible to have the exchange server accept delivery for invalid
accounts and dump them?

 

Thanks Bruce

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