A Free Alternative to MXToolbox for Everyday DNS Checks

MXToolbox's individual MX, blacklist, and SPF/DKIM/DMARC lookups are already free to use on its own site, so "alternative" here is less about cost and more about workflow - checking through a separate external dashboard each time versus having the same diagnostics live on the WordPress site you already manage.

What an on-site alternative adds

Beyond the same MX and blacklist lookups, a plugin-based version can also verify an individual mailbox - something MXToolbox's domain-level diagnostics do not do at all - and run daily automated re-checks once a domain is added, rather than the single weekly monitor on MXToolbox's free tier.

Feature-by-feature comparison

What MXToolbox still does better

For an organization managing several domains that needs inbox-placement analysis and recipient complaint feedback loops across major providers, that depth lives in MXToolbox's paid Delivery Center - a genuinely different tier of tooling than a single-site WordPress plugin is built to replace.

Frequently Asked Questions

Is MXToolbox's free lookup actually free, or is there a hidden limit?

The individual lookups are free with light rate limiting on how often you can re-check the same domain. The paid tiers exist for continuous multi-domain monitoring and deliverability analysis, not for occasional single lookups.

Why check MX/blacklist records from inside WordPress instead of MXToolbox directly?

Mainly workflow - if you are already managing DNS-adjacent settings, forms, or user signups in WordPress, having the same diagnostics one click away avoids the context switch to a separate external dashboard for a routine check.