Issues with sent mail messages after importing from Eudora

[ElGrecus]

After 16 years (!) of use, I finally abandoned Eudora as my mail app since Mountain Lion no longer supports it. I used Eudora Mailbox Cleaner to do the import into Apple Mail.

I did notice one anomaly. I had multiple "Sent" folders in Eudora for each of two email accounts I have. In Apple Mail, all sent messages have the "To" field hidden in the message list. All messages list my name rather than those people who I sent the email to. If I move those messages to Mail's main "Sent" folder, everything works fine and the messages show the recipients name rather than mine. Is there a way to fix this?

Normally I take old messages and put them in a new folder, like, "Sent.2011" but that messes up messages as described above. Has anyone come up with a workaround for this? Thanks for any help you can offer.

[ElGrecus]

So... no one has any experience with this after importing mail from some other program to Apple Mail? I can't be the only one with this issue. Any help would be appreciated.