Apple mail host name

The hostname for Apple Mail is typically imap.mail.me.com for incoming mail (IMAP) and smtp.mail.me.com for outgoing mail (SMTP).

Here are the default settings for Apple Mail:

Note that these settings are for the default iCloud email account. If you have a different email account set up in Apple Mail, the hostname and settings may be different.

Also, if you're using a different email provider, such as Gmail or Outlook, you'll need to use their respective hostnames and settings.