plugins/rssyl/feed.c in Claws Mail before 3.10.0 disables the CURLOPT_SSL_VERIFYHOST check for CN or SAN host name fields, which makes it easier for remote attackers to spoof servers and conduct man-in-the-middle (MITM) attacks.
http://www.thewildbeast.co.uk/claws-mail/bugzilla/show_bug.cgi?id=3106
http://sourceforge.net/p/claws-mail/news/2014/05/claws-mail-3100-unleashed/
http://secunia.com/advisories/60422
http://seclists.org/oss-sec/2014/q1/636
http://lists.opensuse.org/opensuse-updates/2014-10/msg00015.html