HTML mail won. If you work in an office they will use either Exchange or Google Apps; Exchange's default configuration is a fuck you to text-based mail clients.
<p class="MsoNormal"><o:p> </o:p><font size=2 face="Arial"><span style="font-size: 10.0pt; font-family: Arial">Hope you like <i></i><i>all</i> your email looking like this, because the only response you’ll get from your sysadmin should you decide to complain is a snippy remark along the lines of “try using an email client from this century”. Don’t worry, with enough practice you won’t even see the code — just blonde, brunette, redhead₀ <font size=2 face="Wingdings"><span style="font-size: 10.0pt; font-family: Wingdings">J</span></font></span></font></p>
The war is over, friend. Come on home.