IMO 400 addresses is perfectly manageable - I'd put them all on one mailbox and get on with it.
The limit is in the range of 1300ish - it's not exact. It has to do with the way multivalued attributes are stored in the AD database. That said, MSDN tells us that the attribute is hardcoded to a max of 1,123 (though theoretically it could be less if you had really really really long addresses) - http://msdn.microsoft.com/en-us/library/windows/desktop/ms679424(v=vs.85).aspx. Thanks, Brian Desmond [email protected]<mailto:[email protected]> w - 312.625.1438 | c - 312.731.3132 From: [email protected] [mailto:[email protected]] On Behalf Of Michael B. Smith Sent: Wednesday, September 4, 2013 5:05 PM To: [email protected] Subject: RE: [NTSysADM] Limit to how many SMTP addresses a mailbox can have? Why isn't this on the Exchange list? :) The other Exchange MVPs don't read this list.... What attribute do you intend to use to store those email addresses? ProxyAddresses? I think the hard limit is around a thousand. If Brian is around, he can probably answer that. I would have to dive into the schema and I don't want to right now. :) I would do this hierarchically. Create a single user/mailbox that is the final destination for all of this email. Pick some manageable number of email addresses (and no, I don't consider 400 manageable). Then divide 400 by that number X. Create that number of subsidiary mailboxes and configure their Delivery Properties to deliver to the "final destination" mailbox. Assign X SMTP addresses to each mailbox. I would place all the mailboxes in a single OU, and assign the "final destination" mailbox a name that would cause it to sort first in ADUC/ADAC/EAC with a detailed description. From: [email protected]<mailto:[email protected]> [mailto:[email protected]] On Behalf Of Sam Cayze Sent: Wednesday, September 4, 2013 4:57 PM To: [email protected]<mailto:[email protected]> Subject: [NTSysADM] Limit to how many SMTP addresses a mailbox can have? I'm tasked with creating a mailbox that will house over 400 smtp email addresses. Think of it as a big catch-all mailbox. I'm not too worried about setting up a script to make them, I was just wondering if there was a hard limit in place. Also, any other caveats to this? Theirs is a good business justification for this. My other thought it to script the creation of 400+ public folders for each address, which I would be totally happy with, but it's harder to monitor all those for new messages. I guess another option would be to a create about 400 contacts in AD, each forwarding to a mailbox. As long as that too is scriptable, I'm open to it. Exchange 2010 SP1 -Sam
