Simple MML Example
==================
Here's a simple `multipart/alternative':
<#multipart type=alternative>
This is a plain text part.
<#part type=text/enriched>
<center>This is a centered enriched part</center>
<#/multipart>
After running this through `mml-generate-mime', we get this:
Content-Type: multipart/alternative; boundary="=-=-="
--=-=-=
This is a plain text part.
--=-=-=
Content-Type: text/enriched
<center>This is a centered enriched part</center>
--=-=-=--