thanks dan,
so to confirm:
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are you saying, if settings are done correctly, NO email client will ask: “do you trust the SSL”?
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via plesk panel, LETsENCRYPT is done for client domain, call it: XYZ.com
also via plesk, my server has LETsENCRYPT for host.servername.com
then on email client, they using for incoming and outgoing server: XYZ.com
note: all email coming/going on my server goes through host.servername.com, unless I’m wrong?
ps. I know LETsENCRYPT and Plesk are integrated (work well together)… so please correct me where I have it wrong? thanks!!!
PSS. I am lead to believe it’s the iPhone with the issue. my macbook has the “check box”, but iphone does not!