Kuvert was recently featured on the debaday blog, and somebody asked me to put the manual pages on the web.
So here they are, ugly as sin (because I couldn't convince groff or any other converter to render -mdoc manual pages in HTML without breaking them completely):
manpage for kuvert
manpage for kuvert_mta_wrapper
Update (Tue 04.09.2012 21:40):
The manpages have been updated for kuvert version 2.0.7:
Manpage for kuvert
Manpage for kuvert_submit