1. Launch Mac Mail 
  2. From the toolbar at the top, select Mail and then Add Account…
    mac-add-acount

    Other Mail Account

  3. Select Other Mail Account…
    mac-othe-mail

    Account Information

  4. Enter your details
    • Name (which will appear in the ‘From’ field when you send emails)
    • Email Address
    • Password  (Forgotten passwords can be changed in konsoleH)
    • > Sign In

    mac-add-account

    Server Settings

  5. Complete the settings as follows:
    • User Name is the full email address
    • Account Type is IMAP or POP according to preference (IMAP is the default)
    • For domains still in transfer or propagation, temporarily use the IP Address in place of Incoming & Outgoing Mail Server
    • Ignore Unable to verify account name or password
    • > Sign In

    add-account-sign-in

    Server Identity

  6. Ignore the 2 server identity messages > Continue♦ You can add the certificate to your trust settings to avoid seeing this message in the future.

    server-error

  7. Select any apps > Done
    select-apps
  8. Your Mail account is now set up. You will see your new account in the list with any other mail accounts. However, to avoid any future issues, continue with these few tweaks:

    Further settings:

  9. From the top menu choose Mail > Preferences…
    preferences

    Account Information

  10. Choose your new account from the list on the left.On the Account Information tab click the dropdown arrow on Outgoing Mail Server (SMTP), and choose Edit SMTP Server List
    account info

    SMTP settings

  11. Choose the relevant account from the list, choose the Advanced tab, and ensure that:
    • Automatically detect and maintain account settings is not ticked
    • Port is 587
    • Use SSL is not ticked
    • Authentication is Password
    • Allow insecure authentication is ticked
    • User Name is the full email address
    • > OK

    Incoming Server settings

  12. Back on the Accounts screen, choose the Advanced tab and ensure that the Incoming Server settings are correct, specifically:
    • Automatically detect and maintain account settings is not ticked
    • Port is 143 for IMAP (or 110 for POP)
    • Use SSL is not ticked
    • Authentication is Password
    • Allow insecure authentication is ticked

    mac-accounts advanced

    Finish

  13. Close and Save settings when prompted.