mail issue

emmaelf Said:

"mail issue: can't access my mail after updating operating system. I contacted my email provider. Also can access it via webmail but not from mail. I accessed keychain and deleted old data."

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Use a New App Password:

Do you use an App Password? If so, try a new App Password. Sometimes, changes (i.e. updates) are made to the device, and then mail server syncing becomes an issue (which is what a new App Password it intended to fix). Go here for gmail: Sign in with App Passwords - Google Account Help - Google

Try to check the protocol of the mail like IMAP, and pop3 configuration also try entering manual SMTP mail server details, this will help you to sync data from the mail server.