Lo and behold - there is a plugin for MovableType which supports accessing an IMAP or POP email server to create posts from.
That is terrific! I made a simple change and added this around line 253:
$entry->convert_breaks( 'markdown' );
That allows me to send in markdown formatted mails. The default is richtext, which I'm not sure is the right choice for me. I might also use convert line breaks, because I often use ascii text with email.
I found these instructions helpful.
