Some people change their mail address (e.g. John Doe had firstname.lastname@example.org and now he has email@example.com). I would like to keep both as the name shows up in mails. If I look at old mails from j.doe, I have the link to his mail. In my address book, I mark the new one with a star (pref = preferred).
Now, when I compose a new mail, I get autocompletion suggestions for both addresses and there is no way to tell which one I should use (except switching to the address book and look which one is preferred).
Is there a solution for that? I could not find any.
Possible solutions I could imagine (would that be a valid feature request?):
(optionally) show only preferred mail addresses in recipient autocompletion
(optionally) show only the preferred mail addresses if there are multiple and only some/one are/is preferred
(optionally) show an indicator for the pref flag (and rank them first)
(optionally) introduce a new flag or checkbox for mail addresses (“include in suggestions”) independent from the pref-flag