Ptt 大爆卦 | DKIM check - 前往 https://docs.microsoft.com/en-us/microsoft-365/security/office-365-security/support-for-validation-of-dkim-signed-messages

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Support for Validation of DKIM Signed Messages - Microsoft ...

DKIM verification is used automatically for all messages sent with IPv6. Microsoft 365 also supports DKIM when mail is sent over IPv4.

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