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
