When you export OD instance that has mail handlers configured and you import it to your local server you will not be able to re-use mail servers.

Basically they will have the hostname set to localhost, but after you fix that they will still not work. This is caused by our OD configuration - we use SOCKS in OD and we store SOCKS configuration for each mail server.

Editing a mail server doesn't clear those socks settings when in BTF. So you need to remove and recreate all mail servers to make them usable.

Also this implementation is broken for OD - what if we're going to update SOCKS settings? They are now stored so the old settings will be picked up. Fail!