The remote host is missing an update to the system as announced in the referenced advisory.

Update your system with the appropriate patches or software upgrades. http://thread.gmane.org/gmane.comp.horde.imp/15488 http://cvs.horde.org/diff.php/imp/docs/CHANGES?r1=1.389.2.109&r2=1.389.2.111&ty=h http://www.vuxml.org/freebsd/efc4819b-0b2d-11d9-bfe1-000bdb1444a4.html

The following package is affected: imp