Need to know what E-mail address an SQL Agent Operator will send FROM

I have a maintenance plan in SQL Server 2008 R2 that backs up some databases.  I have a failure precedence constraint tied to a "Notify Operator" task.  The e-mail address that it will send to isITHELP@domainname.com.  There are a couple of DB Mail profiles set up on my system.  How do I figure out what e-mail address this notification will come FROM? We would like to set up rules in our Help Desk software to assign tickets to people within the department and we can do this based on the e-mail address that is sending to ITHELP.

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Lee Markum