Eudora surprises me Miraz. I find it such an awful email client to use....so unituative. But, I know lots of people that use it and like it.
Phil
I love it and have used it for many years now. In fact, for 5 years I wrote a weekly Tip on using it - all available in the Tips Archive -
http://mactips.info/tips
Eudora's very simple and straightforward and doesn't have all the clutter of the 'three-paned' apps like Entourage, Mail etc. There are heaps of power user preferences.
One of its biggest advantages is that it doesn't store the email in a corruption-prone proprietary database, but instead in plain text files - one per mailbox - that you can open with any text editor, if you so wish.
Cheers,
Miraz