+delivery path as well as removing the message from the git tree.
+
+* incron - run commands based on filesystem events: http://incron.aiken.cz/
+
+* sendmail / MTA - we use and recommend use postfix, which includes a
+ sendmail-compatible wrapper: http://www.postfix.org/
+
+* spamc / spamd - SpamAssassin: http://spamassassin.apache.org/
+
+* report-spam / dc-dlvr - distributed with public-inbox in the scripts/
+ directory: git clone https://public-inbox.org/public-inbox.git