This repository contains a simple Go application that functions as a sendmail milter
that passively reads incoming e-mails and writes them into individual .eml files.
It's useful as a quick&dirty debugging solution for incoming messages or be used to
retain training data for spam filters when messages would otherwise be redirected
to external servers. For this usecase the -spam flag can be used to write e-mails
into ham or spam directory based on the presence of an X-Spam header (most
likely inserted by a previous milter, like rspamd).
A bunch of code is based on https://github.com/phalaaxx/pf-milters.
$ go get github.com/xrstf/milter-archive
$ ./milter-archive -spam -target /var/lib/archive
2019/05/04 21:01:28 Listening on tcp:127.0.0.1:47256 ...
2019/05/04 21:01:28 Accepting connections now.
After receiving a bunch of e-mails, /var/lib/archive might look like this:
$ ls -lah /var/lib/archive/spam
drwxr-xr-x 2 root root 4.0K May 4 18:58 .
drwx------ 3 root root 4.0K May 4 18:48 ..
-rw-r--r-- 1 root root 2.7K May 4 18:31 2019-05-04T183102.865Z-re-reliable-supplier-for-led-sign-and-display.eml
-rw-r--r-- 1 root root 4.1K May 4 18:35 2019-05-04T183557.810Z-re-iron-core-metal-crawler.eml
-rw-r--r-- 1 root root 2.6K May 4 18:37 2019-05-04T183715.052Z-re-watch.eml
-rw-r--r-- 1 root root 2.6K May 4 18:48 2019-05-04T184804.922Z-re-2019-newest-fashion-ladies-handbag.eml
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