External
MxToolbox
The diagnostic bench for everything email and DNS.
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
Badge
Your tool? Show the listing. The badge links back to this review.
[](https://yourhack.ai/directory/mxtoolbox)Built a tool that belongs in this directory? Submit it for review. Free, actually tested, no paid placements.