I use AOL for my day to day and Agent 1.91 for my other accounts. Agent is very primitive but it is far less likely to send you malware since it is too dumb to open much, no scripts, and it prompts you before it opens HTML.
That Agent 1.91 is even older than my Eudora!!
I like Eudora because I can see all my emails going back Years and Years and sort them into folders. Does any more modern email program let you do that?
That Agent 1.91 is even older than my Eudora!! 
