I have Mail Server.NET version 18.104.22.168 and have two users reporting an identical problem.
Using their mailboxes in IMAP mode with iPhone 4 or 4S some messages on the iPhone cannot be displayed.
If the user uses a traditional client like Outlook, the messages display fine.
The iPhone reports that the message cannot be displayed due to a formatting error and suggests you ask the sender to reformat the message and resend.
I have not extensively tested but the users report that the problem is with messages sent via the WebMail interface and/or in plain text.
Has anyone else has this experience or seen a solution?
Mike in Ohio