Dominic Raferd:
> On 25/08/2022 04:41, li...@sbt.net.au wrote:
> > I have a simple 'mail list' where an alias 'ct...@sbt.net.au' sends email
> > to several recipients, that's been in use since long time.
> >
> > today noticed one of these addresses started bouncing with '5.7.1 SPF
> > unauthorized mail' since just today:
One or more of the following has changed:
- The owner of the envelope sender domain changed their SPF policy
in DNS,
- The receiving SMTP server uses different SPF enforcement settings.
- The sending SMTP client uses a different SMTP client IP address,
- The sending SMTP client sends a different ehlo command (default:
smtp_helo_name = $myhostname),
- The sending SMTP client sends a different envelope sender address
(logged by qmgr, but may be changed with smtp_generic_maps).
Wietse
