Dear mail operators,
A users sends a message to x...@uni-potsdam.de, and the user X there has a
forward set up to their y...@gmail.com address. Now smtpin.uni-potsdam.de
returns a delivery failure from Google Mail:
The following message to<y...@gmail.com> was undeliverable.
The reason for the problem:
5.3.0 - Other mail system problem 550-'5.7.26 This mail has been
blocked because the sender is unauthenticated.\n5.7.26 Gmail requires
all senders to authenticate with either SPF or DKIM.\n5.7.26 \n5.7.26
Authentication results:\n5.7.26 DKIM = did not pass\n5.7.26 SPF
[molgen.mpg.de] with ip: [141.89.64.18] = did not pass\n5.7.26 \n5.7.26
For instructions on setting up authentication, go
to\n5.7.26https://support.google.com/mail/answer/81126#authentication
me22-20020a170906aed600b00a5250f9fcf4si1870841ejb.898 - gsmtp'
Reporting-MTA: dns; smtpin.uni-potsdam.de
Final-Recipient:rfc822;y...@gmail.com
Action: failed
Status: 5.0.0 (permanent failure)
Remote-MTA: dns; [142.251.18.27]
Diagnostic-Code: smtp; 5.3.0 - Other mail system problem
550-'5.7.26 This mail has been blocked because the sender is
unauthenticated.\n5.7.26 Gmail requires all senders to authenticate with
either SPF or DKIM.\n5.7.26 \n5.7.26 Authentication results:\n5.7.26
DKIM = did not pass\n5.7.26 SPF [molgen.mpg.de] with ip: [141.89.64.18]
= did not pass\n5.7.26 \n5.7.26 For instructions on setting up
authentication, go
to\n5.7.26https://support.google.com/mail/answer/81126#authentication
me22-20020a170906aed600b00a5250f9fcf4si1870841ejb.898 - gsmtp' (delivery
attempts: 0)
The SPF of molgen.mpg.de has `~all` (soft fail):
$ dig txt molgen.mpg.de +short
"v=spf1 ip4:141.14.0.0/16 ~all"
and I would expect `~all` to result in Google Mail not rejecting the
message, when another server is sending emails from @molgen.mpg.de. We
do not want to set up DKIM due to the increased message size, and
complexity of key handling. Is there an alternative?
Kind regards,
Paul
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