Gentoo Linux Security Advisory GLSA 200503-26 – Sylpheed and Sylpheed-claws fail to properly handle non-ASCII characters in email headers when composing reply messages. Versions less than 1.0.3 are affected.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/36732/glsa-200503-26.txt
Source: https://packetstormsecurity.com/files/36732/Gentoo-Linux-Security-Advisory-200503-26.html