Spamassassin depends on Perl Net/DNS.pm and this dependency is missing in OpenBSD:
[EMAIL PROTECTED]:~$ sa-update Can't locate Net/DNS.pm in @INC (@INC contains: /usr/local/libdata/perl5/site_perl /usr/lib/perl5/5.8.6/OpenBSD.i386-openbsd /usr/lib/perl5/5.8.6 /usr/local/lib/perl5/site_perl/5.8.6/OpenBSD.i386-openbsd /usr/local/lib/perl5/site_perl/5.8.6 /usr/local/lib/perl5/site_perl /usr/libdata/perl5/i386-openbsd/5.8.6 /usr/local/libdata/perl5/i386-openbsd/5.8.6 /usr/libdata/perl5 /usr/local/libdata/perl5 /usr/local/libdata/perl5/site_perl/i386-openbsd /usr/libdata/perl5/site_perl/i386-openbsd /usr/libdata/perl5/site_perl) at /usr/local/bin/sa-update line 78. BEGIN failed--compilation aborted at /usr/local/bin/sa-update line 78. CL<