Outlook 2010 - "Reply To" linking to wrong Exchange 2010 Internal Email Address

Hi,
One of my internal email users (Exchange 2010 Enterprise) compiled an email from within Outlook 2010 and sent it to a specific internal colleague with a CC to two other internal colleagues plus two external contacts.
They all recieve the email successfully but if any of them (internal & external contacts) try to "Reply" or "Reply All" the "To" for the new email is automatically populated with a completely different and unrelated
internal email account instead of that of the original sender? This occurs when attempted from either thier Outlook or OWA environments.
This appears to be a one off issue, as the original recipient of the problem email has recieved other emails from the same sender both just before and soon after which all behave correctly.
I have looked at the View Source information for the recieved and confused email from Outlooks perspective and there is no reference within the source to the wrong account that get consistantly used for the
purposes of a Reply.
I have never experienced this sort of problem before since administering Exhange etc and would like to understand how it can randonly occur.
Any help would be most welcome.
Regards,
Mark

Hi,
Does this issue happen to other emails or just the certain one?
On the sender side, please go to Send Items folder, find and open the problematic message. Click on File > Properties and check if the user set “Have replies sent to” in the Delivery options section:
If the original email was set with this option, when we click Reply, it will send email to the people typed in the box.
We can also check the message properties on the recipient side.
Please let me know the result.
Regards,
Steve Fan
TechNet Community Support

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