Lacking Natural Simplicity

Oddly enough, both gmail and Lotus Notes prefer the last displayable alternative in a multipart/alternative section. In other words, I sent a multipart/alternative e-mail with once with html, text and pdf alternatives, and once with the same parts, but in the order text, html, and pdf. The first time Lotus Notes and program:gmail displayed the text alternative, and the second time they displayed the HTML alternative. Wanderlust always displayed the HTML alternative.