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examples/sendmail-milter-INSTALL.txt  view on Meta::CPAN

resolving SRS0 addresses (reversed from SRS1 addresses). Per default,
spf-milter only accepts locally resolving SRS0 addresses. If you want full
SRS1 functionality, start spf-milter like so (minimal):

    ./sendmail-milter-spf-1.40.pl -S -r milter

Whether you start spf-milter with -S or not, when relaying, spf-milter is
always SRS aware (that is, when your own mailer is sending TO foreign SRS0,
SRS1 addresses). The "-r" option, outside -S, only has meaning when
relaying.


5. COMMON QUESTIONS ANSWERED
----------------------------

1) Why does spf-milter use the native threaded Milter model?

Because Sendmail::Milter does.

2) How does spf-milter stay stable using ithreads?

Instead of using a multiplexor to split threads over individual child
processes (like MIMEDefang), spf-milter 'locks' (thread-locks) its
callbacks, thus effectively serializing the threads; so you get much of
the effect of what the MIMEDefang multiplexor does (kinda). And since the
'locked' attribute really prevents the threads from clobbering over one
another, you can even use thread-unsafe package calls within those subs,
like to DBI.

3) By serializing all callbacks, do you not reduce performance?

Without locking the subroutines, Sendmail::Milter is simply way too
unstable, and effectively unusable. However, since there are 10 callbacks in
total, each thread is only serialized for those occassions when two threads
try and access the same sub at the same time. Otherwise they run parallel
too: one thread may acces the eom_callback whilst another enters the
helo_callback, for instance. In fact, as long as all threads are just
slightly out of phase with one another (one callback difference minimum),
they all run nicely parallel.

4) Does spf-milter act prior to the DATA phase?

Yes, spf-milter makes its SPF checks before the DATA phase; at
envfrom_callback (at: "MAIL FROM: <address>"), or at envrcpt_callback (at:
"RCPT TO: <recipient>"), when running in "mx" mode.

5) Can spf-milter be used within the same sendmail configuration as
MIMEDefang (and other Milters)?

Yes. Quoting a bit from the libmilter documentation:

+----------------------------------------+
| SPECIFYING FILTERS IN SENDMAIL CONFIGS |
+----------------------------------------+

Filters are specified with a key letter ``X'' (for ``eXternal'').

For example:

    Xfilter1, S=local:/var/run/f1.sock, F=R
    Xfilter2, S=inet6:999@localhost, F=T, T=C:10m;S:1s;R:1s;E:5m
    Xfilter3, S=inet:3333@localhost

specifies three filters. Filters can be specified in your .mc file using
the following:

    INPUT_MAIL_FILTER(`filter1', `S=local:/var/run/f1.sock, F=R')
    INPUT_MAIL_FILTER(`filter2', `S=inet6:999@localhost, F=T')
    INPUT_MAIL_FILTER(`filter3', `S=inet:3333@localhost')

Which filters are invoked and their sequencing is handled by the
InputMailFilters option:

    O InputMailFilters=filter1, filter2, filter3

This is is set automatically according to the order of the
INPUT_MAIL_FILTER commands in your .mc file. Alternatively, you can
reset its value by setting confINPUT_MAIL_FILTERS in your .mc file.
This options causes the three filters to be called in the same order
they were specified.

- Mark

        System Administrator Asarian-host.org

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