1. Make sure that POP Access is enabled in the Zoho Mail interface. (Login to www.zoho.com/mail >> Settings >> Mail Accounts >> POP Access >> Enable POP Access by clicking the checkbox)
2. Open your Mac Mail application. 
3. Select Mail >> Accounts >> Click the + icon in the bottom right, to add a new account. 
4. Choose Other Mail Account, skipping the default options provided.
   ​
5. Specify your preferred Display Name, Email Address of your account in Zoho and your password. 
6. Click Sign In, and provide the configurations details manually.
     
7.  In the next screen, select the Account Type, and the Incoming and Outgoing server details as given below:
   • User Name: Your complete email address (user@yourdomain.com for domains hosted with Zoho and user@zoho.com for personal users)
   • Password: Zoho account password (You may require Application Specific password if Two Factor Authentication is enabled for your account.)
   • Account Type: POP
   • Incoming Mail Server: pop.zoho.com.au for personal users, pop.zoho.com.au for organization users who have their domains hosted with Zoho Mail. 
   • Outgoing Mail Server: smtp.zoho.com.au
   • Click Sign In.
     ​​​
8. Apple Mail verifies the account details and maps the Incoming server details for the account. 
9. The account will get created based on the server details provided. 

 Troubleshooting Mac Mail Configuration:

Authentication Errors:

• In case you get authentication errors, check your POP Status. If POP Status is disabled, Enable POP and try again. 
• Check if you have Two Factor Authentication turned on. (accounts.zoho.com >> Two Factor Authentication) . Generate and use Application Specific Password, for TFA enabled accounts
• In case you are a part of an organization, the administrator may have restricted access via POP to your account. Contact your email administrator for details. 

Connection Errors: 

• Often connection errors happen, when the server details are incorrect. 
• Check if the Incoming and SMTP Server names are correct.
• Check if SSL is turned on for Incoming Server and the port number is 995.
• To check if the port number is correct, go to Mail >> Preferences >> Accounts >> Advanced
  
• Check if the SSL is turned on for the SMTP server, and that the Outgoing Port Number is right.  
• To check the Outgoing Port Number and SSL, go to Mail >> Preferences >> Accounts >> Outgoing Mail Server (SMTP) >> Edit SMTP Server list.
  
• Ensure that the Port Number is 465, SSL is checked, and click Ok.