Please bear in mind that I did all this by ****ing around for many hours, and following my instincts. Server identification problem disappeared. Then I toggled 'Allow insecure authentication', in the same window.

This might be important if you turn TLS/SSL authentication off.īack in mail, I went to 'Advanced POP Settings.' I set the TLS certificate identity to my TLS certificate. I've gone back and found that one can generate a security certificate that is not specifically a TLS certificate. It was simple, but I was running on instinct and can't remember anything about the details. I followed some path that allowed me to create my own TLS certificate. Under Keychain Access, you can now launch Certificate Assistant. When you do this, a pull-down menu appears at the top of the page. You can't find the Certificate Assistant without choosing 'System' in the upper left field. Within Keychain Access, I used 'Certificate Assistant' to create my own TLS certificate. The following the part that I had to make up: (Some variation of this may work without TLS/SSL toggled on. Made sure I had the right port numbers for using TLS/SSL. Turned off 'Automatically manage connection settings'. Went to Mail/Setting/(account name)/Server Settings. I don't know if this is a general solution - it's kind of a kluge - but here's what I did:įollowed the 'official' Apple recommendations at: Your mail is probably already configured by following this process.

There are probably others, but I've pissed away so much time being stubborn about this that I have zero interest in looking further. And.I don't even remember all the other things I tried. Switching back and forth between TLS/SSL and *not* TLS/SSL (and yes, I used the right port settings). All attempts to delete it led to a UNIX( error, whatever that is. Trying to delete the expired certificate. Including:ĭeleting the mail account and adding it back. Mac Mail Sierra Certificate Problem I'm using a late-2016 MacBook Pro, with Retina display and the horrible touch bar.įor *months* I've had a recurring error checking my work email account: 'Mail can not verify server identity.'

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