Not an option. You can look into third party alternatives.
This is a first. I've never seen anyone need to customize the Subject field.
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Russ Valentine
[MVP-Outlook]
"TheScenicRoute" wrote in message
...
How do I mail merge a Contacts field into the Subject Line of an e-mail?

e.g. I want the subject Line of the e-mail to say:

First_Name, I just got married!
-or-
Order confirmation for Full_Name.