> On Nov 19, 2018, at 3:35 PM, Jasen Betts via Exim-users <exim-users@???> wrote:
>
> Ideally you use PRDR if the source requests it.
>
> PRDR:
> https://tools.ietf.org/html/draft-hall-prdr-00
> https://www.exim.org/exim-html-current/doc/html/spec_html/ch-access_control_lists.html#SECTPRDRACL
Keep in mind that PRDR never became an IETF standards-track protocol,
and is not widely implemented. You'll probably find that it won't
be of any help in most cases.
--
Viktor.