I'm using gmail and reading all these well enough...
On Sat, 10 Nov 2018 at 07:32, Neil Johnson <neil.johnson(a)erudicon.com>
wrote:
> TL;DR:
> In never ending battle against SPAM and phishing attacks, some email
> providers are now using DMARC, rejecting or marking as SPAM email if the
> originating mail server doesn't match the authorized ones for the
> provider's service.
>
> For example:
> - Yahoo! is flat out rejecting e-mail from yahoo! mail users if it comes
> from non-authorized servers.
> - Google is marking e-mail from gmail users as SPAM if it comes from
> non-authorized servers.
>
> Unfortunately this breaks mailing list software like mailman (used for this
> list) which tries to make e-mail from the list appear as if it is coming
> from the original sender.
>
> The changes that are required to fix the issue change the functionality of
> the list software in ways users may not like.
>
> I found this out while applying DMARC for my my own domains.
>
> More info can be found at these sites:
>
https://wiki.list.org/DEV/DMARC
>
https://dmarc.org/
>
> Fun.
>
> -Neil
>
> --
> Neil Johnson
>