Andreas has a Ph.D. in physics and works for a small company in San Diego, CA which develops measurement instrumentation mostly for research.
Despite having no formal programming training he keeps his few skills up to date by writing some software on the side, like the very excellent Mail Scripts 
and Eudora Mailbox Cleaner
HW: What kind of Mac do you use?
AA: My personal Macs have always been portable (5300c 100MHz, 3400c 200MHz, G3 “Lombard” 333MHz – all of which don’t exist any longer, TiBook 550MHz – fulfilling its duties as my personal server despite it broken screen hinge – and currently an AlBook 1.5GHz). My first encounter with a Mac was a Mac 128k I had to write a program for during my university days.
HW: How long have you been using Mail.app? What other clients have you used (and why did you stop)?
AA: I switched to Mail.app in January 2002 (I guess that would have been OS X 10.1). Before that I used Eudora (starting with some version 1.x or 2.x back in about 1992). After Eudora more than once mangled mailboxes beyond repair I decided to ditch it.
Apart from that I am using Thunderbird on my PC at work (after ditching Outlook once I realized how bad it did with IMAP accounts).
HW: What plugins and extensions do you use to make your email experience better?
