Package: claws-mail Version: 4.3.0-1 Severity: serious Control: forwarded -1 https://github.com/dinhvh/libetpan/issues/448
claws-mail links with libetpan, which is covered by RSA-MD license (named BSD-RSA in its copyright file). That license has an advertisement clause that is known to be incompatible with claws-mail's GPL license.