1. Open the Mail app on your macOS.
2. From the top menu, click on "Mail" and then click on "Preferences".
3. In the "Accounts" tab, click on the "+" sign to add a new account.
4. Select "Add Other Mail Account" and click on "Continue".
5. Enter your name, email address, and password in the fields provided and click on "Sign In".
6. In the "Incoming Mail Server" section, select "IMAP" as the account type.
7. In the "Mail Server" field, enter "mail.cotse.net".
8. In the "Username" field, enter just your username (no @cotse.net).
9. In the "Password" field, enter your email password.
10. Click on "Sign In".
11. In the "Outgoing Mail Server" section, select "SMTP" as the account type.
12. In the "SMTP Server" field, enter "www.cotse.net".
13. In the "Username" field, enter just your username (no @cotse.net).
14. In the "Password" field, enter your email password.
15. Click on "Sign In".
16. In the "Advanced" tab, select "Use SSL" for both the incoming and outgoing servers.
17. For the incoming server, set the port to "993".
18. For the outgoing server, set the port to "465".
19. Select "Password" as the authentication method for both servers.
20. Click on "OK" to save the settings.