or Pine
Same advantages for pine (now alpine) - all text, no crap. Email from people is text, and I read it. Email from Corporate Entities is generally an attempt to reproduce a Corporate Web Page, and I decline to view that sort of drek. Especially likely to be seen as unwanted are those propaganda missives that include -only- an HTML part, as if their particular shouty message could only be expressed with the garish and vulgar typography they invariably select ("web designers"). Words have always been the best way for me to express and understand complex concepts, so if you're sending me pictures of Shiny Things and your words are "Buy This!", then you've made yourself rather unattractive in the competition for my attention.