New answers tagged smtp
*facepalm* Turned out that the password for this account had been changed on the server. Changing it back again, has fixed the issue.
When I upgraded to El Capitan the new mail.app took it upon itself to create email accounts for my configured SMTP servers. I use gmail and leave my primary home Mac on POP, as a kind of backup. Mail remains on the server and a copy remains on my Mac. It works for me and the volume of email I get. But here mail.app had turned the SMTP servers into an IMAP ...
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