One of those things that seems like it should be trivial but in reality is not...
Can we first ask why they need to be the recipient given they are already the sender (ie in their sent items folder) ?
If you're fortunate enough that the NT username is also short hand email address you could use that, to test, in VBE immediate window type:
Now create a new mail item in Outlook and type in the resulting value and see if OL resolves for you (ie to your mail account) ... if it does it's still by no means watertight.
In short retrieving the mail address of the current user can be a PITA - using LDAP, Redemption etc... if you google you'll find a few examples.
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