I don't seem to be having trouble with email (exim4, mutt) other than 
with popcorn nessages:

>  Date: Mon, 02 Dec 2019 14:31:13 -0500
>  From: Mail Delivery System <mailer-dae...@engels.histomat.net>
>  To: r...@engels.histomat.net
>  Subject: Mail delivery failed: returning message to sender
>
>  [-- Attachment #1 --]
>  [-- Type: text/plain, Encoding: 7bit, Size: 0.5K --]
>
>  This message was created automatically by mail delivery software.
>
>  A message that you sent could not be delivered to one or more of 
>  its recipients. This is a permanent error. The following 
>  address(es) failed:
>
>    sur...@popcon.devuan.org
>      host mail.guardedhost.com [2607:fe90:1:1::1e]
>      SMTP error from remote mail server after pipelined 
>  MAIL FROM:<r...@histomat.net> SIZE=27878 AUTH=r...@engels.histomat.net:
>      553 5.7.1 <r...@histomat.net>: Sender address rejected:
>      not owned by user bro...@historicalmaterialism.info
>
> [-- Attachment #2 --]
> [-- Type: message/delivery-status, Encoding: 7bit, Size: 0.3K --]
>
>  Reporting-MTA: dns; engels.histomat.net
>
>  Action: failed
>  Final-Recipient: rfc822;sur...@popcon.devuan.org
>  Status: 5.0.0
>  Remote-MTA: dns; mail.guardedhost.com
>  Diagnostic-Code: smtp; 553 5.7.1 <r...@histomat.net>: Sender 
>  address rejected: not owned by user bro...@historicalmaterialism.info
>
>  [-- Attachment #3 --]
>  [-- Type: message/rfc822, Encoding: 7bit, Size: 25K --]
>
>  Date: Mon, 02 Dec 2019 14:31:10 -0500
>  From: root <r...@engels.histomat.net>
>  To: sur...@popcon.devuan.org
>  Subject: popularity-contest submission
>
>  -----BEGIN PGP MESSAGE-----
>  ...

It seems popcorn messages are sent by root, but the root address is 
not owned by user. How can I straighten this out? What defines address 
ownership?

Haines Brown 

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