Apparently this is a relatively 'random' SNAFU only biting small subsets of AT&T DSL customers when it does [or else everyone with a Mac has been unable to raise a stink due to lack of email?], but I'm short on time, clue, and access to the affected machine (or a Mac in general to poke at).
Does anyone happen to have any firm technical detail on what's causing the situation described in:
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SMTP auth issues for Torrington @sbcglobal.net user?(Apparently rejecting username/password via SMTP when configured 'correctly,' webmail unaffected.)
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discussions.apple.com/th ··· /4388720 is linked therein regarding the same issue but is mostly speculation and chicken-waving.
Any assistance appreciated - apparently this has been going on for a couple weeks, but I'm loathe to put anyone on the phone to support on T's side.