Can I fix this groups.io problem with a send hook or something

[Chris Green]

On Tue, Nov 24, 2020 at 05:06:54PM +0100, Francesco Ariis wrote:
> Il 24 novembre 2020 alle 15:59 Chris Green ha scritto:
> > I don't know if anyone else has seen this problem but was hoping that
> > someone has and thus has a ready made fix.
> > 
> > I'm on a couple of mailing lists that have recently moved from Yahoo
> > Groups to groups.io.  For DMARC (so they claim) groups.io change the
> > senders E-mail address as follows:-
> > 
> >     Sender Name <sender.name at btinternet.com>
> > 
> > becomes:-
> > 
> >     "Sender Name via groups.io" <sender.name=btinternet.com at groups.io>
> > 
> > 
> > So a R[eply] to sender doesn't work because the address is simply
> > wrong, I get an error back from groups.io when I use R[eply].
> 
> Hello Chris, I myself follow a group that moved to groups.io from yahoo
> (abcusers).
> But I cannot reproduce your problem! The headers seem fine
> 
>     Date: Wed, 28 Oct 2020 17:35:41 -0700
>     From: Pat Anderson <anderson1234 at example.org>
>     To: abcusers at groups.io
>     Subject: [abcusers] We Need a Linux Snap, Flatpak, or AppISomage for EasyABC!
>     User-Agent: GROUPS.IO Web Poster
> 
> and when I press `r` I am prompted
> 
>     Reply to abcusers at groups.io? ([yes]/no):
> 
> then after `n` I edit the message and everything is fine in «To:».
> Am I understanding the problem correctly?  Maybe your group admin changed
> some settings?

It only happens to users from some domains.  I have seen it only with
btinternet.com and ntlworld.com.  Like you I can send replies off-list
to senders from other domains such as gmail and my own isbd.net.

There is a faq entry about it on the groups.io web site, that's where
I found it has something to do with DMARC.

-- 
Chris Green