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Microsoft 365 MX, SPF & DKIM Checker
Enter domains and your Microsoft 365 tenant below. IP address for SPF check can be changed if needed.
Enter unique code override (up to 3 characters) to update guesses live for domains with a hyphen.
Domains (comma or newline separated):
Microsoft 365 Tenant Name (e.g., contoso):
.onmicrosoft.com
IP Address for SPF Check:
Show MTA-STS Suggestions for domains with no record?
Check DNS for M365 Entries
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