Undelivered Mail Returned to Sender
This is the Planio mail system at host fsn1-app04.hosts.plan.io.
I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.
If you do so, please include this problem report. You can
delete your own text from the attached returned message.
The Planio mail system
<firstname.lastname@example.org>: host gmail-smtp-in.l.google.com[220.127.116.11] said:
550-5.7.26 The MAIL FROM domain [turnbackhoax.id] has an SPF record with a
hard 550-5.7.26 fail policy (-all) but it fails to pass SPF checks with the
ip: 550-5.7.26 [18.104.22.168]. To best protect our users from spam and
phishing, 550-5.7.26 the message has been blocked. Please visit 550-5.7.26
https://support.google.com/mail/answer/81126#authentication for more 550
5.7.26 information. z13-20020a5d4d0d000000b00241e0cee1fbsi6535247wrt.295 -
gsmtp (in reply to end of DATA command)