I noticed at http://iatistandard.org/201/upgrades/#open-consultation-on-all-proposed-changes:
If you wish to discuss an idea before submitting a proposal you may wish to consult the IATI Technical Mailing List first.
I understand that this mailing list is now closed, replaced by this forum. Therefore, it could be useful to update this guidance text.
Thanks Steven, great spot - @rory_scott is working on fixing this today, as well as checking and correcting for any other references to the IATI Technical Mailing List.