Mimecast Recommended SPF, DKIM and DMARC settings – DNS Inbound Authentication

You can also tighten down SPF to only allow specific email address to send from third party services instead of whole domain : https://www.jamieweb.net/blog/using-spf-macros-to-solve-the-operational-challenges-of-spf/

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Andrea Rochira Well, this solution still works in 2023 and better than PowerShell! Thank you.
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Emre Temel Thank you for this information. You save my life. 🙂
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Maurece The information I needed when I needed it, Thanks Pariswells.com
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