We have a sales unit that needs 5000 email addresses but we don't want to create an AD account with mailbox for each one. Sales is a revolving door so we want little management as possible. The reason for these email addresses is to create an iTunes account for the iPads to be deployed. We will be managing these accounts and the sales manager wants one mailbox to manage and have these mailboxes as an additional SMTP. First question is what is the max limit of SMTP's to add? Second, is there another way to do this like a 3rd party program?