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メール配信ヘルス無料チェッカー

メール配信到達率を総合的にチェック — MX、SPF、DKIM、DMARC、60以上のブラックリストを無料で確認。登録不要で、0〜100のスコアと改善のための提案を取得できます。 — Nova Uptimeはアップタイム、SSL、メール健全性、リンク変更を1つのダッシュボードで監視します。

What We Check

A comprehensive analysis of your domain's email infrastructure in one click.

MX Records

Mail Exchange records define which servers receive email for your domain. Misconfigured MX records mean email never arrives.

SPF Record

Sender Policy Framework prevents email spoofing by listing which servers are authorized to send email on your behalf.

DKIM Record

DomainKeys Identified Mail adds a digital signature to verify that emails haven't been tampered with in transit.

DMARC Record

Domain-based Message Authentication tells receiving servers how to handle emails that fail SPF or DKIM checks.

Blacklist Status

We check your mail server IPs against 15+ major DNS-based blacklists to ensure your emails aren't being blocked.

Overall Score

Get an A-F grade with a detailed breakdown and actionable recommendations to improve your email deliverability.

Common Questions

What is an email health check?

An email health check analyzes your domain's email authentication setup — MX records, SPF, DKIM, DMARC, and blacklist status. It gives you a score from 0-100 (grade A to F) and recommends fixes to improve email deliverability.

How do I check my SPF record?

Enter your domain above and click "Check Email Health." The tool automatically looks up your SPF TXT record, validates its syntax, checks the policy strength (-all vs ~all vs ?all), and counts DNS lookups to ensure you stay under the 10-lookup limit.

What is DKIM and why does it matter?

DKIM (DomainKeys Identified Mail) adds a digital signature to outgoing emails so receiving servers can verify the message wasn't tampered with. Without DKIM, your emails are more likely to land in spam folders.

How do I improve my email deliverability score?

Fix any critical issues first: add missing SPF/DKIM/DMARC records, upgrade your SPF policy from ~all to -all, set your DMARC policy to quarantine or reject, and check that your mail server IPs aren't blacklisted.

Is the email health checker free?

Yes, the email health checker is completely free with no sign-up required. You can check any domain as many times as you want.