Thanks to Jeffrey Tolar too, who was the first who mentions hunspell. Regarding the new issue I sent a mail to the Claws list. http://lists.claws-mail.org/pipermail/users/2015-May/013062.html Regards, Ralf "I" is marked as incorrect, while "i" is correct :D.
Hello Ralf, I'm happy to read that your issue is semi-solved. I like issues that make you tinker, it just proves that when a bunch of people gather together, and make different suggestions, nothing remains 'unsolved'. Cheers