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License: Other
Scripts to prevent a mail server from generating backscatter
License: Other
This repository contains scripts to prevent a mail server from generating backscatter: https://en.wikipedia.org/wiki/Backscatter_(email) Traditionally, preventing the generation of backscatter has required either rejecting undeliverable messages during the SMTP transaction, or discarding undeliverable messages. The former is not always technically feasible, and the latter is very bad for usability (since legitimate senders receive no feedback that their message couldn't be delivered). This repository proposes a better solution: bounce undeliverable messages only when the return address can be authenticated using either SPF or DKIM. This eliminates backscatter, since bounces will never be sent to a forged return address, while still providing feedback to users of modern mail providers which support SPF or DKIM. This repository is divided into two sub-directories: milter - contains a sendmail-/postfix-compatible mail filter (milter) that implements the above logic for bounces originated by your MTA. mailman - contains a Mailman extension that implements the above logic for bounces generated by Mailman (such as those generated when a non-member posts to a members-only list).
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