4 months back Micro soft decided to update my old computer. (It was first window 7 but updated to 10 a while back. It worked on 10) Next morning, the computer was not as good as a Lego but was a plast...
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I would suspect something in the IMAP settings. Outgoing server settings are different with IMAP. The various email providers have tutorials on their websites telling how to set up different email readers, I'd start there.
