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452; Too many recipients received this hour

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452; Too many recipients received this hour - 19.Oct.2007 2:23:34 PM

defiantclass1

Posts: 218
Joined: 17.Jul.2006
Status: offline

Hello,

I have been receiving a few NDRs stating "452; Too many recipients received this hour". They seem to be created from emails going to the same location (our other office) which controlls their own mail. I don'tknow if the problem resides on my end or their end. They have not received the messages we got NDRs for, that much I know.

Could anyone tell me what are the best things on my side, Exchange 2003 SP2, that I should look for? If it's on their end, I would at least like to be able to confirm that anything related to this message on my end is set correctly.

My server is newly up and running, so I'm afraid I don't have any history of emailing this location through this Exchange server successfully to compare recent activities to.

Thank you

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RE: 452; Too many recipients received this hour - 22.Oct.2007 9:15:34 AM

defiantclass1

Posts: 218
Joined: 17.Jul.2006
Status: offline

Does anyone have any insight on this NDR? It's been a number of days and I'm still receiving them. Is there an SMTP setting that would causing the Exchanger server to not allow more than x number of messages to go out?

It seems to happen when we try sending to a particular domain my company uses: johnsmith@comanyname.com, which is a pop account.

Thanks.

(in reply to defiantclass1)

Post #: 2

RE: 452; Too many recipients received this hour - 22.Oct.2007 11:37:59 AM

Jesper Bernle

Posts: 912
Joined: 15.Oct.2007
Status: offline

This is a anti-spam feature that I guess that the other part of your corporation is using. If too many attempts to send mail happens within a specific time frame it�s regarded att an attack and the anti-spam feature kicks in and denys connection attempts.

This is common to see if you have mail queuing up to some remote domain (for whatever reason) and it starts working and your Exchange Server releases all the messages at once, thus mailbombing the remote domain.

So, check to see if you at times are sending lots of mail to the remote domain and if you do, check to see if they (or ISP) have some anti-spam features at work.

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Jesper Bernle | Microsoft Community Contributor 2011 Awardee

(in reply to defiantclass1)

Post #: 3

RE: 452; Too many recipients received this hour - 22.Oct.2007 12:49:37 PM