The issue is Apple Mail was unable to verify the identity of the server”pop3.knology.net”.
My operating system was updated from Mavericks to High Sierra and the Apple email at present is functionally useless.
Customer service with WOW cable is out of their experience with this and referred it up to synacor.com?No response yet.
I see multiple expierences online with this in forums, I have tried the simple fixes to no avail. I understand Apple is aware of this issue?
Mac Pro (Late 2013), 3.7 GHz Quad-Core Intel Xeon E5,Mac Pro,
12 GB 1866 MHz DDR3, AMD FirePro D300 2048 MB……
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Lee
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How Do I Resolve “Apple Mail Was Unable To Verify the Identity Of the Server?”
Comments: One Response to “How Do I Resolve “Apple Mail Was Unable To Verify the Identity Of the Server?””
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I'm sorry, but I don't know how I can help here beyond a few recommendations. I'm sure the problem is that your old POP email system is not compatible with modern email clients.
Suggestions:
Move away from your ISP's email. See my video on this: Five Reasons Not To Use Your ISP’s Email Service. Until you do, you'll probably have this problem and many more.
If your email service offers modern IMAP instead of POP email, then switch to that. POP email is old and only meant to work with one device, from back when everyone checked their email from their one computer, and not multiple devices like computers, phones and tablets. Maybe if they offer IMAP and you set your login credentials to that, then you can fix this problem as a benefit.
Whether you switch to IMAP or continue to use POP, this is probably due to something in your credintials being wrong. It could be the server name. It could be your ID or passwords. IDs on old ISP email systems are tricky. For instance, if your email is example@knology.netnt, then your ID could be example+knology.net or something odd like that. The only way to know for sure is to carefully read all of your ISP's technical documents that pertain to this.
Even if you have the perfect credentials it could be that your ISP's old email system just isn't using the modern standards that Mac Mail is using. For instance, it could be using an old security protocol (or none at all) and Mac Mail just isn't going to work with it.