Eudora was licensed software that was worth every nickel, in my humble opinion, and I gladly paid the very reasonable license fees as new major versions became available.
The application came in ad-sponsored mode and also a full-featured paid version. There may have been a feature-limited free version as well, I really can’t remember.
Below you’ll find several registration codes that you can use to enable Eudora to run as your needs dictate. I haven’t personally used any of them – no need, I have my own – but I have it on pretty good authority that they all work as described.
Paid mode without X1 Search capability
First Name: Eudora Paid Mode
Last Name: Without X1 Search
Registration Code: 6114-6862-8270-5863
Unknown extent of capabilities
First Name: Generic
Last Name: User
Registration Code: 3291-5783-8333-3015
Paid mode, full-featured
First Name: Eudora
Last Name: Freereg
Registration Code: 7955-6070-6698-1421