🛠️ Tool
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Freemium
Beginner
Why we picked it A single search bar to look up your SPF, DKIM, DMARC, MX, and PTR records, plus a blacklist check across dozens of blocklists. It is the fastest way to confirm your DNS records actually propagated correctly and match what your ESP told you to set, before you assume the problem is something else.
MxToolbox SuperTool
From MxToolbox
- Checks SPF, DKIM, DMARC, MX, and reverse DNS from one search box
- Flags common SPF mistakes like exceeding the 10 DNS lookup limit
- Scans your sending domain and IP against 100-plus blacklists
