I have a Mac Pro using OSX 10.7.4.  When using apple mail I click on the address icon to obtain email address and nothing happens.  I've restarted both the application and the Mac but still won't open address book.  Any ideas please.

I have a Mac Pro using OSX 10.7.4.  When using apple mail I click on the address icon to obtain email address and nothing happens.  I've restarted both the application and the Mac but still won't open address book.  Any ideas please.

Assuming you have these accounts set up in Mail, open preferences and under Accounts tab, edit the SMTP outgoing server list. Do you have a .mac address in the list? If so, delete it.
Are you using iCloud?
For the troubled account, select the correct SMTP server for that account in the box and check the box to use only that server with that account.

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