A. Even though libmilter is officially supported in sendmail-8.12, you need to build and install it in separate steps. Take a look at the RPM spec file for sendmail-8.12. The %prep section shows you how to create a site.config.m4 that enables MILTER. The %build section shows you how to build libmilter in a separate invocation of make. The %install section shows you how to install libmilter with a separate invocation of make.
A. RedHat forgot to include the header in the RPM. See the RedHat 7.2 requirements.
To use this with sendmail, add the following to sendmail.cf: O InputMailFilters=pythonfilter Xpythonfilter, S=local:inet:1030@localhost See the sendmail README for libmilter. sample milter startup
A. You need to tell sendmail to connect to your milter. The sample milter tells you what to add to your sendmail.cf to tell sendmail to use the milter. You can also add an INPUT_MAIL_FILTER macro to your sendmail.mc file and rebuild sendmail.cf - see the sendmail README for milters.
A. Sendmail only milters SMTP mail. Local mail is not miltered. You can pipe a raw message through sendmail to test your milter:
$ cat rawtextmsg | sendmail myname@my.full.domainNow check your milter log.
File "mime.py", line 370, in ?
from sgmllib import declstringlit, declname
ImportError: cannot import name declstringlit
A. declstringlit is not provided by sgmllib in all versions
of python. For instance, python-2.2 does not have it. Upgrade to
milter-0.4.5 or later to remove this dependency.
milter.error: cannot add recipient?
A. You must tell libmilter how you might mutate the message with
set_flags() before calling runmilter(). For
instance, Milter.set_flags(Milter.ADDRCPT). You must add together
all of ADDHDRS, CHGBODY, ADDRCPT, DELRCPT, CHGHDRS that apply.
NOTE - recent versions default flags to enabling all features. You
must now call set_flags() if you wish to disable features for
efficiency.
A. Libmilter expects "rcpt to" shortly after getting "mail from".
"Shortly" is defined by the timeout parameter you passed to
Milter.runmilter()
or milter.settimeout(). If the timeout is 10 seconds,
and looking up the first recipient in DNS takes more than
10 seconds, libmilter will give up and break the connection.
Milter.runmilter() defaulted to 10 seconds in 0.3.4. In 0.3.5
it will keep the libmilter default of 2 hours.
A. sample.py is a sample. It is supposed to be easily modified for your specific needs. We will of course continue to move generic code out of the sample as the project evolves. Think of sample.py as an active config file.
If you are running bms.py, then the block_chinese option in
/etc/mail/pymilter.cfg controls this feature.
A. Sendmail has a problem with unix sockets on old versions of OpenBSD.
Use an internet domain socket instead. For example, in
sendmail.cf use
Xpythonfilter, S=inet:1234@localhostand change sample.py accordingly.
OpenBSD users report that this problem has been fixed.
A. Configure sendmail to use virtusertable, and send all unknown addresses to /dev/null. For example,
@mycorp.com dev-null dan@mycorp.com dan sally@mycorp.com sally
dev-null: /dev/nullNow your milter will get to the eom callback, and can change the envelope recipient at will. Thanks to Dredd at milter.org for this solution.
A. Check the sendmail log for errors. If sendmail is getting milter timeouts, then your milter is taking too long and sendmail gave up waiting. You can adjust the timeouts in your sendmail config. Here is a milter declaration for sendmail.cf with all timeouts specified:
Xpythonfilter, S=local:/var/log/milter/pythonsock, F=T, T=C:5m;S:20s;R:60s;E:5m
A. The bms.py milter supports spf. The RedHat RPMs will set almost everything up for you. For other systems:
tempdir. The RedHat RPM uses logrotate for
logfiles and a simple cron script using find to clean
tempdir.