imapsync 1.564 and earlier performs a release check by default, which sends sensitive information (imapsync, operating system, and Perl version) to the developer's site.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2013-4177
https://bugzilla.redhat.com/show_bug.cgi?id=1000215
http://www.securityfocus.com/bid/65002
http://www.mandriva.com/security/advisories?name=MDVSA-2014:060
http://lists.fedoraproject.org/pipermail/package-announce/2014-March/130493.html