I've had problems w/ one of several GMX accts in Tbird for few days.
All settings are correct, PW's been reset (few times), CAN login thru webmail & send / rec. But on ONE acct, "cannot access the server for unknown reasons," or "mail server pop.gmx.com responded: authentication failed."
After MUCH checking, I think I've finally found the problem, but no idea how it's happening or best action.
Long forgotten, I had another GMX acct w/ similar email name. But, there's no acct for it in TB / accounts, NOR any mail folders for it in the Profile.
The older one had NO period after my 1st initial: firstname.lastname@example.org
Newer, active one ( IS set up in TB) HAS a period after my 1st AND middle initials. DB.Cooper@gmx.com IT is the active one I can login via webmail) & also proper email address in TB's acct settings. Yes, it's spelled correctly everywhere in TB acct.
I RESET the PW on GMX & can login webmail w/ it. I finally !^$@&%# discovered after deleting the entries in TB PW file (several times) AND deleting entries for the inactivated acct that,
each time I delete these PW entries from TB's file, & then re enter new PW when prompted, it often stores the good PW, but dredges up the old, defunct acct name & puts the new PW w/ it. IOW, It RE enters in the PW file (signons.sqlite), the new PW w/ the defunct email address (the "dcooper" instead of "DB.Cooper.")
BUT, sometimes it stores the good PW w/ the CORRECT acct name in the PW file (like outgoing smtp - mail.gmx.com). But still can't send from that acct. Get same errors.
Q-1: Where's TB dredging up the old acct name?
In about:config, there are some entries for the old "dcooper" acct, like"
mail.identity.id12.archive_folder...w/ value: mailbox://email@example.com/Archives
also entries for same "....id12." for Sent, Drafts, Templates.
Other repetitious entries for "...id16" & "...id17" - as above. Then 2 more about:config entries for the defunct acct:
All these 10 - 12 entries for the defunct acct are "User Set," but could have been changed by ???, long ago.
Q-2: How do I stop TB from using some old acct name, not found in current Profile? One thing I'm not sure of is the chance of OTHER file(s) in the Profile\Mail folder (other than actual mail boxes) being corrupt. If I delete / recreate the current problem acct in TB, & copy ALL Mail folder files to new acct, any problem might follow. Would it be wise to delete any files in this acct's mail folder, like popstate or *.msf? Though I doubt that's where TB gets the old acct name.