DSPAM is best integrated with sendmail by masquerading as the local delivery agent. This can be done by adding two lines to your config.mc file and rebuilding your configuration:
define(`LOCAL_MAILER_PATH', `/usr/local/bin/dspam') define(`LOCAL_MAILER_ARGS', `dspam "--deliver=innocent" --user $u -d %u')
Make sure these definitions are placed before the MAILER(local) definition.
Alternatively, you may define additional procmail arguments if you are using procmail. For example:
define(`LOCAL_MAILER_PATH', `/usr/local/bin/dspam')
define(`LOCAL_MAILER_ARGS',
`dspam -t -Y -a $h "--deliver=innocent" --user $u -d %u')
If you don't feel like rebuilding your .cf files, you can alternatively just replace your local mailer in the Mlocal block of sendmail.cf and submit.cf. Be sure to update the path (P=) as well as arguments (A=).
NOTE:
If you are using sendmail restricted shell (smrsh), you will need to either disable it, or add /usr/local/bin/dspam to the allow list. Some administrators have experienced problems using smrsh with DSPAM.