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We will test your SPF, DKIM, and DMARC configuration and report the test results in the system, with instructions on what to do if we find an issue.
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We tell them that it is OK. This is done by using something called "sender header". We basically add some information to your email clarifying to email receivers that the "from" is actually "us", sending on behalf of "you".
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If you don't want this message to show, authenticate using your own domaindomain or disable automatic authentication for domains missing SPF and/or DKIM authentication in Settings > Account settings > Deliverability Checkup > Authentication. However, we strongly recommend keeping it on for better deliverability.