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[Migrated from MSDN Exchange Dev] old company still can send mails on the behalf of ABC.COM domain

Eric Yin-MSFT 4,386 Reputation points
2020-11-11T06:25:37.063+00:00

Origin link: https://social.msdn.microsoft.com/Forums/office/en-US/08e192a1-6c41-4c80-bfa1-00bfa7a30f74/old-company-still-can-send-mails-on-the-behalf-of-abccom-domain?forum=exchangesvrdevelopment

ABC.COM domain and MX is transferred to new company , after send\receive happening via new company.

Also observe that old company can still send mails on behalf of ABC.COM domain

How to restrict the same?

Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
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  1. Eric Yin-MSFT 4,386 Reputation points
    2020-11-11T07:17:33.75+00:00

    What is remained on the old company? An Exchange server whose default accept domain is ABC.com?
    You can set up SPF record for your domain to specify which mail servers are permitted to send email for that domain name, follow this blog to create SPF: https://practical365.com/exchange-server/a-sender-policy-framework-spf-primer-for-exchange-administrators/

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