On Fri, 11 Jan 2019, ????? ???????? via Exim-dev wrote:
Hello, the last discussion about PRDR http://www.eric-a-hall.com/specs/draft-hall-prdr-00.txt on ietf-s...@ietf.org was in March 2014. https://www.ietf.org/mail-archive/web/ietf-smtp/current/msg07655.html The question was if PRDR will make any progress. One of the answers was that nobody uses it, despite being implemented in exim: https://www.ietf.org/mail-archive/web/ietf-smtp/current/msg07658.html To make progress with PRDR please switch the default for enable_prdr to True. As exim is the only software that implements this, only the compatibility exim ? exim has to be tested and this has been done.
https://www.ietf.org/mail-archive/web/ietf-smtp/current/msg07656.html (Wed, 5 Mar 2014) suggests that MeTA1 (http://www.meta1.org/) also implements PRDR.
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