Cannot link gmail account to iMac

Open Keychain Access in Utilities, then either check the Password under that item, change it, or delete it and start over.

Enter the part after the @sign in the search bar.

You may have duplicate or more entries in Keychain Access.

If using a browser to login via WebMail works it's not Name or Password, but likely old passwords interfering.

There''ll be at least 2 entries, maybe more.

The trouble is that Mac Mail almost always chooses the old Passwords if you don't change or get rid of the old ones.

if 2 factor verification is enabled in the gmail account one needs to use the app password rather than the password one login on their webclient

https://support.google.com/mail/answer/185833?hl=en

The mail app on my iMac (OS 10.14.6) seems to be faulty. First, I cannot install G-mail as a new account. Second, the mail jumps for about 45 seconds when I switch to it from another app. I thought another mail account caused the problem and I deleted it but the mail app still jumps and flutters. Can I delete the mail app and re-install it? Would that help? Any good ideas? John

Good news, great to hear! :)

No, the Mail App is tied to the OS, you have to Re-install the whole os to get Mail App.

I'd start a new topic to get personalized help. :)