2008-11-07 12:22:09 UTC
FQDNs in the destination field for record type MX works fine. I've created a test zone called "jon.com" with MX record to mail.jon.com (a FQDN) on the demo site:
http://smbind.sourceforge.net/src/record.php?i=660
Note that if you're doing an import, you need to be wary of appending '.' to the end of your names. The commit process does that automatically, so DON'T add an appending '.' when working with the database.
Somone has written an import script, so if you poke around in the forums, you might find where it was been uploaded. I've never tested it myself, so I don't know how well it works.
Comment back if you're still having trouble.