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If you receive a "554 5.7.9 Message not accepted for policy reasons" delivery error, it may be due to an issue with the sender not using DMARC. When an email is automatically forwarded from...
1 Μαΐ 2023 · When an email fails DMARC authentication, some email providers may reject or mark it as spam. In your case, it seems that Yahoo is rejecting the invitations sent from your Google Calendar because they fail DMARC authentication.
"This is because Yahoo no longer accepts messages where the From domain is a Yahoo mail domain, and the message originates from a non-approved Yahoo mail domain server/service. This is a security measure they have implemented to help reduce potential address spoofing of their mail domains.
16 Δεκ 2022 · Remote Server returned '554 5.7.9 Message not accepted for policy reasons. See https://postmaster.yahooinc.com/error-codes' Mail that is received to office 365 email address is forwarded to yahoo and generates this error.
18 Ιαν 2019 · In short, “554 message rejected for policy reasons” email delivery error can happen due to recipient server restrictions, bad DNS records, and more. Today, we’ve discussed the top 3 reasons for this error and how our Server Support Engineers fix them.
5 Ιουν 2012 · If you follow the bounce code that is closest the one listed in your provided bounce, you are taken to a page that references issues with Yahoo failing authentication checks against your sending domain's DomainKeys or DKIM policy.
This error occurs because Yahoo cannot verify that the email arrived from a legitimate sender. To avoid such situations Yahoo recommends using the following technologies: Was this answer helpful?
