There are 2 Options depending on the email client you want to use :

Option 1 : Using Google Mail with Microsoft Outlook for Mac

Instructions for Outlook 2011 on OS X

  • From the menu bar, click Outlook and go to Preferences.
  • Click the Accounts button.
  • Click the + button, and select E-mail...
  • Enter the details for your account as follows:
    • Email/Username: Your Google Apps email address
    • Password: Your Google Apps password
    • Type: IMAP
    • IMAP Server:
    • SSL Enabled, Port 993
    • SMTP Server:
    • SSL Enabled, Port 587
    • Ensure the Override default port and Use SSL to connect boxes are checked.
  • Click Add Account.
  • Select your newly added account from the list. In the right pane, select More Options... under the SMTP settings.
  • Set the authentication option to Use Incoming Server InfoClick OK.
  • Close the preference pane to begin using your email.

Option 2 : Using Google Mail with Mac Mail

Instructions for OS X 10.5 - 10.7

  • Go to System Preferences
  • Open Mail, Contacts & Calendars
  • Click the + to add a new account
  • Select Gmail as the account type
  • Enter your details, click Set Up
  • Select the items you would like to sync
  • Open Mac Mail to begin using your email

Instructions for OS X 10.8

  • Go to System Preferences
  • Open Mail, Contacts & Calendars
  • Select Gmail from the accounts list
  • Enter your Google Apps login details
  • Select the items you wish to synchronise
  • To sync contacts, open the Contacts app.
  • Go to the Contacts > Preferences menu.
  • Switch to the Accounts tab
  • Click + to add a new account, and select CardDAV as the account type