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Adding these “aliases” is easy.
Now macOSXHints offers a tip that shows you how to add a different name for each alias by editing the com.apple.mail.plist file. Be sure to read the comments as well for some extra tips and tricks.
This is especially useful if you run a business, community or charitable email address as an alias on the same account as your personal email. Now, for example, pta@anywhereville.ga.us can display “Anywhereville PTA” in the From field, while you keep your own name for personal emails.
Tags: alias, mail.app