Why are emails sent from an Active Directory user to an outside organization appearing to come from a different sender than that AD user?

Alright, we have an Active Directory user, Chuck Cable, and he is using MS Outlook 2002 on an Exchange server. When Chuck sends an email to a specific email address outside of our organization, the email shows "From: Stanton, Tommy" on the email at the recipient's end. Tommy Stanton used to work for our company several years ago, but his account is not even in our AD any more. The account isn't just disabled, but it has been removed altogether a long time ago.  

When the recipient replies to this email, it goes back to Chuck's inbox, but the person addresses him as Tommy Stanton because that's how it appeared on the recipient's end. The attached text file is a set of exchanged emails between Chuck and the recipient, Pam, who eventually refers to Chuck as Tommy.  I hope that makes sense.

I have checked his AD account's properties and didn't notice anything strange.  His Outlook settings all look right, there are no delegates set. Is this possibly just a caching issue on the other organization's end? As far as I know, Chuck tells me this is the only person who replies and addresses him as Tommy.
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Can you get the headers?  The answer is probably in there.

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columbusdataAuthor Commented:
I had to look up how to find the email headers, but once I found that, it got me started in the right direction. Thanks!
the answer is probably in the header, but just an additional thought.
is it the email address, or the display name that is incorrect.
it may be a simple issue for the person on the other side (the recipient).
if they have the user in their address book with an incorrect display name that may actually be it.
columbusdataAuthor Commented:
davidgreen7373 got me in the right direction...

Once I was able to view the headers of that email on Chuck's computer, I found that the recipient was replying to "Tommy Stanton" <sales@oecfh.com>.  Since Tommy is no longer with us, all emails to <sales@oecfh.com> go to Chuck Cable.  The issue then is on the recipient's end as they have that email address cached as Tommy Stanton.

Thanks David!
columbusdataAuthor Commented:
You're right on hodgeyohn. I was in the middle of typing my last comment when you posted that though.
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