Yeah! Now you're getting into the Clarity(TM) spirit!
Interesting... The server will be a box in somebody's closet at their office; I'll have to find out the name. Since you guys set up a virtual "mail." server for each custom domain here, I guess we'll have to make sure it's not named "mail." to keep from having to make you guys do something on the DH end.
Oooh... Sounds like some serious Interface Inconsistency(TM) in the DH CP; the user should be asked to enter the same thing no matter what tab they're under. Or maybe this is one of those things for which you should have "Beginner" and "Advanced" interfaces, under each of those tabs, for consistency. Beginner mode would ask for just the host name, and advanced would allow the user to enter the weight. And I would think the system should add missing a trailing period and/or default weight anyway, regardless of interface, knowing it's an MX record. (But hey, that's just me.)
Anyway, I'm going to do this with a Code Warrior account, so there's no DNS Management tab... I'd be doing this under "Mail -> MX Record" so I take it I just enter the "beginner" version.
So the weight is the server's priority, yes? As in primary (0), secondary (1), etc.?
And... I take it I should not go to "Domains -> Manage" and click on "mail -> [Deactivate]". Correct? Or would it make any difference? I'm guessing that changing the MX record just bypasses any mail settings/mailboxes/etc. there might be for a domain. (I suppose there should also be some info about all this next to the MX change fields under the various tabs.)
And following up to that... Does changing MX affect the mail settings? We probably will want to use DH as a backup mail server (so we can take down the office box, etc.) If I were to change the MX selection back to DH, would all the mailboxes, etc., still be in place (assuming I don't [Deactivate])?