User Settings -> Forward E-Mail to Netmail doesn't have clear path to remove it

If one sets a forwarding address, when trying to remove it, there's no clear option to do so or hint on how to do it.

If you simply clear out the email address when it asks, it says that's invalid.

If you put in a '0' (or some other non-valid address), it seems to shut it off (retaining the invalid entry?), but I have the feeling this didn't use to be quite as unclear?

If one puts in a valid entry (ftn-type or email), then Synchro asks "[√] Forward personal e-mail to network mail address? [Yes] No"

I think something's a little amiss.