Summary
The remote host is missing an update to the system as announced in the referenced advisory.
Solution
Update your system with the appropriate patches or software upgrades.
http://people.freebsd.org/~niels/issues/nbsmtp-20050726.txt http://www.vuxml.org/freebsd/debbb39c-fdb3-11d9-a30d-00b0d09acbfc.html
Insight
The following package is affected: nbsmtp
