Fixed: PostMasterMailbox.pl hangs parsing mails (bug#10532).
Squashed commit of the following:

commit dfb08bdbbebffa574a3c4177393110c94b65ed42
Author: s7design <otrs@s7designcreative.com>
Date:   Thu Jun 19 14:54:08 2014 +0200

    http://bugs.otrs.org/show_bug.cgi?id=10532

    remove style tags