I've created a service account mailbox in exchange 2010 that I need to use for a custom application. However, I don't want it to receive any emails. If I restrict the "Mailbox Settings => Storage Quotas => Prohibit send and receive at" to a small number as a workaround, will an "Undeliverable" message be sent to any user emailing to the global address list once the mailbox reaches its limit?
To answer your question directly, yes people (inside the organization) should get an undeliverable message if the message is rejected because of quota limits.
However, I would take a different approach. In Exchange 2010, your Exchange administrator can go into the EMC and create a transport rule which applies specifically to this mailbox with the actions of "send rejection message to sender with enhanced status code", or "Delete the message without notifying anyone".
This is something that, in the future, will be a lot easier for people to understand (assuming you and/or the exchange admin ever leave).
If you don't want it to receive any e-mails then it probably doesn't need a mailbox. Mailboxes are generally only for receiving and storing e-mail. You can configure many applications to just send e-mail from an invalid (no mailbox and the e-mail address doesn't exist in your e-mail org) internal e-mail address. I do this all the time for internal e-mail notifications, because I can easily put in the FROM: field where the mail came from:
[app or server name]@domain.com
If you still need a mailbox for this account then here are your options:
- If you just don't want people to know it exists by browsing the GAL, then open the mailbox in the EMC and click "Hide from Exchange Address lists".
- If you don't want people to accidentally send mail to it by it being a member of a distribution group, go to the "Member Of" tab and make sure it isn't a member of any distro groups.
- If you don't want it to get mail period, then you can play around with the Mail Flow Settings tab>Message Delivery Restrictions or Message Size Restrictions or the Mailbox Settings tab>Storage Quotas (Note these options will likely throw an NDR response to the sender)