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The sendmail Mail Filter API (Milter) is designed to allow third-party
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programs access to mail messages as they are being processed in order to
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filter meta-information and content.
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NOTE: With Sendmail 8.12.0 and above, the Milter API is built-in.
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Before 8.12.0, both libmilter and the callouts in sendmail are marked
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as an FFR (For Future Release). This means that support is *NOT*
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guaranteed - but things have been working well, and the usenet/mailing
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list (comp.mail.sendmail) does help if you have questions/problems.
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Everything you'll need to create a milter filter is contained in
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/usr/share/doc/sendmail (for which you need to install sendmail-doc):
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- libmilter/README Document on build/install/config for milter
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NOTE: see updated make in milter directory
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- cf.README Document on configuring milter in sendmail.mc
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- RELEASE_NOTES Any late breaking news
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and /usr/share/sendmail/examples (for which you need to install sendmail):
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- examples/milter/* Sample milter filter and makefile