Re: Undelivered Mail Returned to Sender

Am 15. Juli 2020 um 14:39 Uhr schrieb "John W. Eaton":
> On 7/15/20 6:31 AM, Markus Mützel wrote:
> > Am 15. Juli 2020 um 11:58 Uhr schrieb "John W. Eaton":
> >> On 7/11/20 4:28 AM, Markus Mützel wrote:
> >>> Do you think they could help setting up the email forward of [email protected] to [email protected] correctly?
> >>> At the moment gnu.org rejects some of the messages because the sending domain and the IP of the dreamhost server mismatch (see above).
> >>
> >> I'm not sure what to ask them to do.
> >>
> >> I have many forwards for each list on the server (not sure that all are
> >> needed, but I added them to be complete since all of these are used by
> >> mailmain):
> >>
> >>     [email protected]  [email protected] 	
> >>     [email protected]  [email protected]
> >>     [email protected]  [email protected]
> >>     [email protected]  [email protected]
> >>     [email protected]  [email protected]
> >>     [email protected]  [email protected]
> >>     [email protected]  [email protected]
> >>     [email protected]  [email protected]
> >>     [email protected]
> >> [email protected]
> >>     [email protected]
> >> [email protected]
> > 
> > To be honest, I thought that the mail server on octave.org was managed by dreamhost. But from what you've written, I gather that you manage mailman on that server yourself?
> 
> The mailman mailing list manager runs on a gnu.org system.  There is 
> also an smtp mail server running on dreamhost that handles the mail for 
> the octave.org domain.  It forwards the mail sent to @octave.org 
> addresses that are used for the mailing lists (like those shown above) 
> to the @gnu.org addresses where mailmain processes the list mail.
> 
> > If that isn't possible, maybe we could also ask gnu.org to whitelist the IP of the mailserver on octave.org.
> 
> I will ask about that.

Whitelisting the dreamhost mail server is probably only the second best solution.
That would mean that gnu.org would need to accept messages from their server independent on the sender domain. That could lead to an increased amount of spam on the mailing list if others are using the dreamhost servers to send or re-route their spam.
Imho, the best solution would still be if the mailserver that does the forwarding would apply SRS when forwarding the mails:
https://en.wikipedia.org/wiki/Sender_Rewriting_Scheme

But I'm still not sure how the dreamhost product works:
Do they just provide the hardware and you can run any server software with any configuration you would like?
Or do they provide (among other things) an email server for which you just entered the forwards in some kind of web form?
Or is it still something different?

Markus