If you are using IncrediMail 2 Address Book, Contacts can be added in three different ways:
1) Click on the ‘Contacts’ icon in your main IncrediMail window to open your Address Book.To open the New Contact dialog, click the ‘New Contact’ icon in the Address Book window.
2) To add a Sender from a message you received, right-click on the message and select the ‘Add Contact’ option to open the ‘New Contact ‘dialog.
3) When communicating with a Recipient who is not in your Address Book, IncrediMail automatically recognizes the correspondence and adds that Contact to the ‘Suggested’ tab of your Address Book with the user’s current Display Name. You can add your Contact from here too.