Returned mail: see transcript for details （2024.03.15）
The original message was received at Fri, 15 Mar 2024 15:02:01 +0200 (EET)
from ybxxqq54.secure.ne.jp [27.34.153.54]
----- The following addresses had permanent fatal errors -----
jenni.m.kokko@gmail.com
(reason: 550-5.7.26 This mail has been blocked because the sender is unauthenticated.)
(expanded from:
----- Transcript of session follows -----
... while talking to gmail-smtp-in.l.google.com.:
>>> DATA
<<< 550-5.7.26 This mail has been blocked because the sender is unauthenticated.
<<< 550-5.7.26 Gmail requires all senders to authenticate with either SPF or DKIM.
<<< 550-5.7.26
<<< 550-5.7.26 Authentication results:
<<< 550-5.7.26 DKIM = did not pass
<<< 550-5.7.26 SPF [tundra2000.com] with ip: [2a0b:5c81:1c1::41] = did not pass
<<< 550-5.7.26
<<< 550-5.7.26 For instructions on setting up authentication, go to
<<< 550 5.7.26 https://support.google.com/mail/answer/81126#authentication 21-20020ac25f55000000b005131ec4cffdsi920459lfz.274 - gsmtp
554 5.0.0 Service unavailable
