[X4U] Mail question

[Mary C. Youra]

In Mail, is there a way to view the "real" incoming address, and not  
just the shortened, familiar name? For example, I have a rule set to  
alert me whenever I receive mail from "jon" in the From with a sound.  
This catches any email, though, from my Jon, whether he's using Jon  
or Jonathan, as well as any of the Jones. I know this isn't the best  
rule I could devise--I should list each of Jon's email addresses--but  
I'm still curious about my question. This morning, I had to run a  
search before discovering it also triggered:  
jon_s20 at freehealthstuff.com which landed rightly in my Junk folder,  
but displayed only the name Weston Kelly. I had to open the email to  
understand why that address met the criteria (which I'd rather not  
do). It seems like viewing complete or real addresses without opening  
emails would be useful in general.