How can I change incorrect "date received" info in Mail?

When I switched to Mavericks I had to leave behind Eudora, which I liked.  I started using Mail, but when Mail imported my email files from Eudora it misdated many of the files, using the date the file was imported as the "date received".  Since I use the date to help me keep track of sequencing of emails received, having this incorrect date thrown in is a problem, but I can't find any way to correct it.
Exactly how can I correct the "date received" on mislabeled emails?  The dates were correct in my Eudora files, but I can't access those any more now that I'm on Mavericks, so I'm going to have to manually check the emails to find the dates in the headers or message contents.
I'm not highly tech savvy, so if I have to go into the Terminal, I'll have to know exactly what prompts to look for and what specific information to provide, and in what format.
Help!

Hi Stuart.
Open /Applications/Utilities/Terminal, type the following command (you can just copy it here, paste in a text editor, modify the email address, then copy the whole command again, and paste in Terminal), and press <Return>:
defaults write com.apple.mail UserHeaders '{"Reply-To" = "[email protected]";}'
The following article contains a more thorough description of this technique that takes into consideration the possibility that you might inadvertently overwrite other default headers by doing that:
How to Add a Reply-To Header to All Emails You Send in Mac OS X Mail

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