From: Email Addresses in Apple Mail 5.0 for OS X Lion
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Apple's Mail.app still does not support multiple sender identities, such as for example "John Doe email@example.com" and "Johnnie firstname.lastname@example.org" through the graphical user interface. However, there is a hint how it is done in Apple Mail up to and including Snow Leopard.
In Mac OS X Lion, Mail has reached version 5 and Apple has introduced a new layout for Mail's Library folder, which is called "V2".
Here's how you can still use multiple identities in Lion.
The "Mail" folder in the
~/Library folder now contains nothing but a single subfolder aptly called "V2":
1 % ls ~/Library/Mail/V2 2 EWSemail@example.com 3 IMAPfirstname.lastname@example.org 4 MailData 5 Mailboxes 6 RSS
While previously, one had to edit
~/Library/Preferences/com.apple.mail.plist, in Lion, the dictionary to edit resides in
This file can be edited with Xcode, which is a free download from the App Store but comes in at a hefty 3.5GB. Alternatively, you can edit it in any text editor.
Be sure to quit Mail and make a backup copy of the file first.
To gain access to the
~/Library folder in Finder, hold down the ⌥ (alt) key and choose the menu command Go → Library.
In the end, the file should look similar to the one shown below (in Xcode):