Message file missing error MailSite produces a "Message file missing" error, even though the message is delivered successfully.

An error such as the one below is sent from the postmaster account to the user:

Your message has encountered delivery problems to the following recipient(s):

no.body@no.where.com
Delivery failed
Message file missing

This error occurs when the auto-reply function is enabled on a mailbox, but the auto-reply text is left blank.

In order to rectify this problem, either:

1. Disable auto-reply for this mailbox
2. Enter a reply for the auto-reply message