Some time ago I started maintaining a mirror of Claws mail CVS repository into git.
That is not necessary anymore, the Claws Mail team have made the move to git, so now upstream itself is using git \o/ (
Also notice that they have recently merged core and plugins repositories.
I have just deleted the github repositories corresponding to each CVS repository (claws-mail, claws-mail-plugins and claws-contacts), and disabled the scripts that have been doing the updates.
Claws Mail team, thanks for the move to git!