I use Mail for my AT&T email account on a High Sierra Mac. Recently, I've been getting alerts that the session has timed out and nothing works. Although the Outgoing Account shows AT&T, when I check the outgoing mail server list, it is completely blank. No server is listed. It does this even when the mail account is functioning. Restarting, running various disk repair programs provided no help. I suppose it is a preferences problem, but I hate to lose my email history.
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