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Maximum number of recipients on Exchange 2000

Posted on 2010-03-31
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Last Modified: 2012-08-13
Hello,

We are using Outlook 2007 and Exchange 2000 Server Standard. I have not put a recipient limit on the Exchange server or on the individual mailboxes. Is there a limit to the number of recipients that Exchange can handle? Here is why I ask - this morning, one of our staff members sent a single email message to about 1000 recipients. She did not receive an error and my Exchange server did not throw any errors (even in the Event Log). However, it was at the same time that the email was sent that my Exchange Server stopped sending/receiving external emails. Rebooting the Exchange Server corrected the problem. I am trying to figure out if they are related. What would be a reasonable limit to set on each user's mailbox?

TIA!
Susan
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Question by:nouses9
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Don S. earned 2000 total points
ID: 29226178
I'm not sure there are any hard limits, but there are practical limits.  I think you will find that because of modern spam filtering on other poeple's servers, sending emails with many recipients will get blocked by them.  And, you obviously ran into a practical limit of having your exchange server trying to resolve 1000 addresses and send the message to them at best will tie the server up for a very long time.  Generally keeping the recipient list under 100 seems to work in most situations.  In this case, less is more.  Oh, and distribution lists are not a way around it.  exchange just has to work to expand and resolve all of the members of the distribtuon list before sending anyway.
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Author Closing Comment

by:nouses9
ID: 32654242
I was hoping for some additional information on this topic. Also, the solution did not include how to set the limits in Exchange. I had to research that myself - however, I did not really ask that so I can't fault the responder.
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