A bit off-topic: problems with sending to a Gmail user

[Matthias Apitz]

El día viernes, marzo 11, 2022 a las 03:12:41p. m. +0100, Stefan Hagen escribió:

> > 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.
> 
> 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.

Thank you, Stefan.

I did such a test and the result can be seen here: 
https://www.mail-tester.com/test-ahwup3i9z

> 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.

As far as I understand all the changes can't be done on my host (a
laptop). I send mails with mutt and mutt with sendmail to smtp.1blu.de

And I'm afraid, if I contact the support of 1blu I don't know if they will
react (I've mixed experience from the past). I will give it a try...

Thanks

	matthias

-- 
Matthias Apitz, ✉ guru at unixarea.de, http://www.unixarea.de/ +49-176-38902045
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