The Bare Bones Essential Checklist For Sending Solid Email
sendicate.net
sendicate.net
I don't want my mail client to have to rat me out to the sender when I open the message, just because their template depends on loading images from the web (apparently some mail clients now do this again by default? Madness!).
I don't want to parse the sender's message through a complex (and historically fragile) HTML parser just to give them the opportunity to make the message more difficult to read.
E-mail is about communicating a textual idea - the text is what matters. Let me decide how I want to render that so I can best digest it.
The good news is that you can decide how to view your emails. For Apple Mail try running "defaults write com.apple.mail PreferPlainText -bool true"
A viable text/plain part is extremely important - it means my MUA (http://sylpheed.sraoss.jp/en/ is fantastic, btw) doesn't have to try and mangle down HTML in to something readable.
I would suggest just turning off the HTML part though, it's superfluous once you have a working text/plain 8^)