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The response from the remote server was:
450 4.7.26 Service does not accept messages sent over IPv6 [2607:f8b0:4864:20::832] unless they pass either SPF or DKIM validation (bad or invalid public-key record). AS(206) [LV8P222MB1238.NAMP222.PROD.OUTLOOK.COM 2025-01-28T17:14:54.929Z 08DD3EBE72A29BD5] [BLAPR03CA0055.namprd03.prod.outlook.com 2025-01-28T17:14:54.950Z 08DD3F553C0081B5] [BN1PEPF00006003.namprd05.prod.outlook.com 2025-01-28T17:14:54.947Z 08DD3E63EE6D430E]
Sounds like you havenโt set up SPF and DKIM for your domain. See https://support.google.com/a/answer/140034?hl=en for more details of how to do that.
Hope that helps,
Ian
Ian has it right; providing a couple more direct resources to help articles here ๐
SPF: https://apps.google.com/supportwidget/articlehome?hl=en&article_url=https%3A%2F%2Fsupport.google.com...
DKIM: https://apps.google.com/supportwidget/articlehome?hl=en&article_url=https%3A%2F%2Fsupport.google.com...
These will require you to access DNS and input the appropriate records.
DKIM will be verified via the admin console once DNS records have been updated.
Cheers,
Andrew
This playbook on SPF/DKIM/DMARC might help as well: https://docs.google.com/document/d/1mER-I5POhrlfcOTzfR1dw3MQFcKvKKw4o3IyQKSz3fU/edit?tab=t.0#heading... -KAM
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