A couple of days ago I wrote about my interest in using Shortmail (SM) and Posterous to write mini blog posts.
At the time, Shortmail wasn’t working as I wanted it to, and I suspected a problem with the signature it auto-appends.
The helpful guys at Shortmail wrote to me explaining that you can remove the automatic signature in the SM account settings.
I also needed to authorize my SM account for Posterous publishing, as I only had my Gmail one activated.
Problem solved. This is proof.