Re: Undelivered Mail Returned to Sender

[Markus Mützel]

> Am 10. Juli 2020 um 18:29 Uhr schrieb "chloros":
> > On Fri, 2020-07-10 at 17:38 +0200, Markus Mützel wrote:
> > > Am 10. Juli 2020 um 17:34 Uhr schrieb "chloros":
> > > > Hi Markus,
> > > >
> > > > the same thing happened to me on wednesday when I replied to one of
> > > > the
> > > > jsondecode emails. I got the same error:
> > > >
> > > > DreamHost Email Support
> > > > <octave-maintainers@gnu.org> (expanded from <maintainers@octave.org
> > > > >):
> > > > host eggs.gnu.org[209.51.188.92] said: 550-[SPF] 64.90.62.163 is
> > > > not
> > > > allowed to send mail from gmx.de.
> > > >
> > > > Yet another gmx feature ...
> > > >
> > > > Best regards
> > > >
> > >
> > > I'm not sure this is gmx's fault in this case. I don't think they can
> > > do anything if the gnu server bounces the message that dreamhost
> > > forwards...
> > >
> > > Markus
> > >
> > 
> > Hi Markus,
> > 
> > when i search for 'SPF', i get hits that display "Anti-Spam". That
> > already rings like a bell in my ears. I don't know exactly either, but
> > what i understand is, that the recipient's mail server (eggs.gnu.org)
> > comes to the conclusion that the sender IP is not authorized to send
> > emails for the domain 'gmx.de', according to the SPF record. But then
> > the SPF record for gmx could be broken.
> > 
> > For example if i check online for 'gmx.de':
> > SPF Authentication: SPF Failed for IP - 64.90.62.163
> > 
> 
> From the results of a reverse lookup on that address, I'd guess that the IP 
> in the error message belongs to dreamhost:
> PS > nslookup.exe 64.90.62.163
> Name:    mx1.dreamhost.com
> Address:  64.90.62.163
> 
> That's why I'd think it is ok that SPF says that no messages from the gmx.de 
> domain should be sent from that IP. And hence, it is probably ok for gnu.org 
> to reject that message.
> 
> Instead, dreamhost should probably adapt the sender in the header:
> https://en.wikipedia.org/wiki/Sender_Rewriting_Scheme
> 
> Markus
> 

Forgot to keep the mailing list in CC.