Sonoma 14.2 upgrade has disabled my Mac.com email account

After upgrading, there's now the 'alert' icon beside my Mac.com account title in Mail, and when I click on it I get the following error:

"Mail was unable to connect to server “p65-imap.mail.me.com” using SSL on the default ports. Verify that this server supports SSL and that your account settings are correct."

Cannot see where o view or edit that setting, and I can't seem to delete the account so I can try to re-set it up.