Hello,

I'm using a mail archiving solution where all the mailboxes send copy of the messages to an archiving mailbox, then the archiving solution get those messages and flush the archiving mailbox. If the archiving mailbox grow or have a lot of messages, could be an issue in the archiving. 
I would like to receive an alert when archiving mailbox has more than 15 messages or some thing like that.

Thanks and Regards,

Jorge