Mac OS X

1: Open Finder and launch the Mail application.
 

 
2: Click the Mail menu and select Preferences.

 

 
3: Click the Accounts icon at the top of the window and then click the plus sign (+) at the bottom-left of the window to add an account. 

 

 
4: Enter your Full Name, Email Address and Password. When finished, click the Continue button 

 

 
5: From the Account Type drop-down menu, select IMAP. 

 

 
6:  Enter a Description to differentiate this IMAP server from others you may have added to Mac Mail.
Enter the Incoming Mail Server.
Enter your full e-mail address as the User Name.
Enter the e-mail account’s Password.

Click the Continue button when finished  

 

 
7: Enter a Description to differentiate the 1&1 SMTP server from others you may have added to Mac Mail.
Enter  the Outgoing Mail Server.
Check the box for Use Authentication
Enter your full e-mail address as the User Name.
Enter the e-mail account’s Password.
Click the Continue button when finished. 

 

 
8:Review the information entered on the the Account Summary page. If all information is correct, check the box for Take account online and click the Create button.

 
9: Close the Accounts window.
 

 

 
10: Your mail should be downloaded and displayed in the Mail window.