I was getting the below error in my mail error log files:
spamd[10632]: Can't locate Sys/Hostname/Long.pm in @INC (@
INC contains: ../lib /usr/share/perl5 /etc/perl /usr/local/lib/perl/5.8.7 /usr/l
ocal/share/perl/5.8.7 /usr/lib/perl5 /usr/lib/perl/5.8 /usr/share/perl/5.8 /usr/
local/lib/site_perl) at /usr/share/perl5/Mail/SPF/Query.pmApparently a bug in ubuntu dapper, where libmail-spf-query-perl depends on libsys-hostname-long-perl.
Doing an `apt-get install libsys-hostname-long-perl` resolved the issue.
