Tools - Automatic Replies - only one of my three email accounts is listed.

Under Menu - Tools - Automatic Replies, the Account dropdown selector only lists one of my three email accounts (and its not the one that I want to configure an automatic reply for). Help?

Automatic Replies is only available if your server supports it; currently it works with GMail and Exchange. GMail also needs to be setup with IMAP for this to work, and Google Settings needs to be enabled. If those conditions are met, the account should be available in the dropdown.