Zehr.net

iPhone/iPad - Email Certificate not Verified
After iPhone/iPad Updates OR after Mail Server Major Upgrade:
The Mail Server SSL Certificates although valid, are not seen as verified because they are not preloaded in iPhone
(see below image)
IOS 10 / 11 ... click continue if option available

IF YOU DO NOT SEE CONTINUE?


Delete the IMAP account and start over.

IN COMING
server: mail.__________
Username: full email
Password: _______
---Advanced Settings were left as default
SSL On
Authentication: Password
Port 993


OUT GOING MAIL
server: mail.__________
Username: full email
Password:___________
SSL On
Authentication: Password
Port 587

Clicked Done, it verified slowly, then popup which did have a Continue option, which I clicked. Then it verified more and again another popup with another Continue option, which I clicked. Then after a minute about, it completed and the mail received and sent fine.

NOTE: Make sure MAIL is allowed to use cellar data if not on wifi. If not allowed, it gets stuck in verify and you will need to close MAIL.