The Free Red Sift Alternative for Email Deliverability

Korpo.pro is the free Red Sift alternative for instant SPF, DKIM, DMARC, MX, MTA-STS, TLS-RPT, and BIMI checking — no enterprise contract required.

Check Your Domain Free →

Why choose Korpo.pro over Red Sift?

✓Completely free — no enterprise pricing or annual contracts
✓7-protocol audit vs Red Sifts DMARC-centric approach
✓Instant results with no onboarding or setup needed
✓Unified 0-100 deliverability score across all protocols
✓MTA-STS, TLS-RPT, and BIMI analysis included
✓No vendor lock-in — check any domain instantly

7-Point Deliverability Audit

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SPF

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DKIM

✓

DMARC

✓

MX

✓

MTA-STS

✓

TLS-RPT

✓

BIMI

Try it now — free

Other Alternatives

Mail-Tester Alternative MXToolbox Alternative DMARC Analyzer Alternative DMARC Report Alternative EasyDMARC Alternative Valimail Alternative DMARCLY Alternative Postmark DMARC Alternative Proofpoint Alternative Barracuda Alternative Mimecast Alternative Google Postmaster Tools Alternative dmarcian Alternative PowerDMARC Alternative Trustifi Alternative Red Sift Alternative Agari Alternative ZeroBounce Alternative Mailchimp Alternative SendGrid Alternative Mailgun Alternative IntoDMARC Alternative Validity 250ok Alternative Bouncer Alternative Mailtrap Alternative