Postmark Alternative — Free Email Deliverability Checker

Korpo.pro is a free alternative for checking email deliverability. Unlike Postmark's DMARC tool, we cover SPF, DKIM, DMARC, MX, MTA-STS, TLS-RPT, and BIMI.

Check Your Domain Free →

Why choose Korpo.pro over Postmark DMARC?

7-Point Deliverability Audit

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SPF
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DKIM
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DMARC
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MX
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MTA-STS
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TLS-RPT
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BIMI

Try it now — free

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