On Fri, Mar 11, 2022 at 03:12:41PM +0100, Stefan Hagen <sh+m...@ptrace.org> 
wrote:

> Mark H. Wood wrote (2022-03-11 14:40 CET):
> > On Fri, Mar 11, 2022 at 11:43:53AM +0100, Matthias Apitz wrote:
> > > I know, it's not the fault of our beloved mutt, but maybe someone is or
> > > was in the same problem and knows a solution...
> > > 
> > > We (my family) are member of a fisherman association and I have to send
> > > mails to one of the head members in charge for youth training. He has a
> > > Google mail account as <xxx...@gmail.com> and any mail gets rejected by
> > > Google with the response below.
> > 
> > I've been seeing a lot of that lately.  Google seem to have tightened
> > their email security practice recently.
> > 
> > It appears that 1blu is doing something that GMail doesn't like.  They
> > probably have a number of users who have the same problem.  I would
> > ask them to check their MTA configuration against the section "Make
> > sure your messages are authenticated" in the referenced page
> > (https://support.google.com/mail/answer/81126#authentication).
> > 
> > >     550-5.7.26 This message does not have authentication information or 
> > > fails to
> > >     550-5.7.26 pass authentication checks. To best protect our users from 
> > > spam, the
> > >     550-5.7.26 message has been blocked. Please visit
> 
> Authenticated in this context means, you don't have SPF / DKIM / DMARC set up.

That's sad. I'm pretty sure that the absence of SPF/DKIM/DMARC
was never supposed to be interpreted as a failure of any of them.
Perhaps the sending domain does have SPF but it's not
setup correctly. It doesn't seem to (unixarea.de).

> You can use this service: https://www.mail-tester.com to test your
> setup. It provices you an email address. Send an email to it
> and then your mail and server setup will be evaluated.
> 
> This is an example from me:
> https://www.mail-tester.com/test-3ghr082f2
> 
> Feel free to examine it and set your host up in a similiar way.

A good tutorial site for setting it up (at least with debian+postfix) is at
https://www.linuxbabe.com/mail-server/build-email-server-from-scratch-debian-postfix-smtp
(in 12 parts, part 4 is SPF+DKIM, part 5 is DMARC).

> Best Regards,
> Stefan

cheers,
raf

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