Re: Undelivered Mail Returned to Sender

> 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
> > > > <[email protected]> (expanded from <[email protected]
> > > > >):
> > > > 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.