Sendmail Milter Question

[Paul Howarth]

Yang Xiao wrote:
> Hi guys,
> Is it possible to use multiple milters with sendmail?

Yes.

> and if so, what
> determines the order they are applied?

The order in which you specify them in your confINPUT_MAIL_FILTERS entry in 
the .mc file.

> include(`/usr/share/sendmail-cf/m4/cf.m4')dnl
> VERSIONID(`@(#)ohpp')dnl
> OSTYPE(linux)dnl
> FEATURE(nocanonify)dnl
> MASQUERADE_AS(ohpp.com)dnl
> FEATURE(allmasquerade)dnl
> dnl Milter
> dnl APPENDDEF(`conf_sendmail_ENVDEF', `-DMILTER')
> define(`MAIL_HUB', `mail.domain.com')dnl
> define(`SMART_HOST', `mail.domain.com')dnl
> define(`confFORWARD_PATH', `')dnl
> define(`STATUS_FILE', `/var/log/mail/statistics')dnl
> define(`UUCP_MAILER_MAX', `2000000')dnl
> FEATURE(`smrsh',`/usr/sbin/smrsh')dnl
> dnl SpamAssassin Milter
> INPUT_MAIL_FILTER(`spamassassin', `S=local:/var/run/spamass.sock, F=,T=C:15m;S:4m;R:4m;E:10m')
> dnl ClamAV Milter
> INPUT_MAIL_FILTER(`clmilter',`S=local:/var/run/clamav/clamd.sock, F=,T=S:4m;R:4m')dnl
> define(`confINPUT_MAIL_FILTERS', `clmilter')dnl

define(`confINPUT_MAIL_FILTERS', `spamassassin;clmilter')dnl

> dnl FEATURE(always_add_domain)dnl
> FEATURE(use_cw_file)dnl
> FEATURE(use_ct_file)dnl
> EXPOSED_USER(`root')dnl
> MAILER(smtp)dnl

At least that's how I *think* you do it in sendmail 8.12.x. I'm using 8.13.x 
and only run milters on the MTA daemon, not on the MSA:

MAIL_FILTER(`headercheck-milter', 
`S=unix:/var/run/headercheck-milter/headercheck-milter.sock, F=T, 
T=C:4m;S:4m;R:8m;E:16m')dnl
MAIL_FILTER(`spfmilter', `S=unix:/var/run/spfmilter/spfmilter.sock, F=T, 
T=C:4m;S:4m;R:8m;E:16m')dnl
FEATURE(`no_default_msa')dnl
DAEMON_OPTIONS(`Port=smtp, Name=MTA, 
InputMailFilters=headercheck-milter;spfmilter')dnl
DAEMON_OPTIONS(`Port=submission, Name=MSA, M=Ea')dnl

Paul.