The last lines of the debug output ------------ procheader.c:155:generic_get_one_field: empty line tnef_parse.c:295:Tnef parser parsing part (41902). tnef_parse.c:297:content: /home/user/.claws-mail/mimetmp/claws.4I0P4Y Attempting to parse /home/user/.claws-mail/mimetmp/claws.4I0P4Y... suspecting a corrupt file in UTF8 conversion ------------
They indicate a problem with the TNEF-PlugIn. When deactivating it claws-mail works without problems. So this is related to the package "claws-mail-tnef-parser". I will wait for maintainers advise.