Undelivered Mail Returned to Sender （2024.03.30）
This is the mail system at host ratikka.iki.fi.
I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.
For further assistance, please send mail to postmaster.
If you do so, please include this problem report. You can
delete your own text from the attached returned message.
The mail system
gmail-smtp-in.l.google.com[2607:f8b0:4002:c10::1b] said: 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: [2001:67c:2b0:1c1::199] =
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
h6-20020a256c06000000b00dc743c449ccsi2024271ybc.49 - gsmtp (in reply to end
of DATA command)
