This mailer has a lot of features one might want in a mail reader, but its bugs are irritating. For instance, it prints mail messages with linefeeds included, which has never been a Unix standard, even though its targets are only Unixoid.
Also it defaults to showing you a blank screen after showing a message, which is of dubious use.
The code is sophomoric, but on the other hand is relatively clear and uncomplicated. This is a package ripe for improvement.
Not MH compatible!
The documentation and the blurb suggests that sylpheed is MH compatible, but it still doesn't maintain the MH sequences files! These are basic to the operation of MH. The unseen sequence is THE WAY to record what has been seen and what hasn't. The mh cli commands need it to work correctly.
I have been asking about this for like two years now. When's it going to be there?