MxToolbox
The diagnostic bench for everything email and DNS.
About MxToolbox
MxToolbox runs the checks every mail admin eventually needs: MX records, SPF, DKIM, DMARC, blacklist status and SMTP tests. The individual lookups are free, with paid plans adding monitoring and delivery analytics.
Best for: Use this when email from your domain is bouncing or landing in spam and you need to find out why.
Pros
- One-stop shop for email deliverability lookups
- Blacklist checks across many providers at once
- SuperTool switches between dozens of lookup types quickly
Cons
- Continuous monitoring requires a paid plan
- Dense result pages take some reading
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