email authentication failures:

Why Do Email Authentication Failures Occur?

There are several reasons why email authentication failures happen:
Incorrect SPF Records: When the SPF record is not correctly configured or updated to include all sending servers, emails can fail authentication.
DKIM Misconfiguration: If the DKIM signature does not match the signing domain or is improperly set up, it can lead to failures.
DMARC Policy Errors: A DMARC policy that is too strict or not aligned with SPF and DKIM can result in legitimate emails being rejected.
Changes in DNS Settings: Updates or errors in DNS settings can disrupt authentication protocols.

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