Mail ceased working with 'Plusnet' in UK despite checking all mail settings, works with other isp's

Run three e.mail accounts through Mail no problems. Then 'plusnet' in the UK stopped connecting, on an imac and macbook at the same time! I changed nothing. MSN account not affected. Plusnet have confirmed all settings but still doesn't work. Any ideas please? It's my first mac problem in several years and its ANNOYING ME!

Have a read of this.
A recent update is forcing Mail to use SSL/TLS which is unsupported by Plusnet's mail servers. You need to disable SSL, enable the option allowing insecure transport and disable the advanced option to automatically maintain settings.
Hope that helps.

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