MXToolbox

MXToolbox is best known for free DNS and blacklist checks, but the paid Delivery Center adds inbox placement analysis, complaint reporting, mailflow monitoring, configuration analysis, and domain impersonation protection. It is a practical utility layer for teams that want monitoring before a full DMARC suite.

Growth work lives or dies on targeting and measurement. What matters is whether behavioral triggers can be built without engineering time, whether the event stream supports attribution past the open, and whether deliverability holds when broadcast volume shares a reputation with product email.

Against behavior-triggered journeys, broadcasts, and winback campaigns measured on revenue, MXToolbox covers event stream, and does not cover scheduling, the suppressions API, and multi-tenant support. Whether that gap matters depends on how central those are to the build.

• Scheduling: No
• Event stream: Yes
• Deliverability: Not a sender. Useful for blacklist monitoring, configuration checks, inbox placement, complaint visibility, and sender reputation investigation.
• Operating since: Not published
• Suppressions API: No
• Best published rate per 1,000: Tiers not published in comparable form
• Multi-tenant: No
• Free tier: Free plan with 1 weekly blacklist monitor for 1 domain
• Starts at: $129/mo for Delivery Center with 5 domains and 500,000 message volume

Not a sender. Useful for blacklist monitoring, configuration checks, inbox placement, complaint visibility, and sender reputation investigation.

Teams that want DNS, blacklist, mailflow, and delivery monitoring in one utility platform.

A small sender that only needs basic DMARC report parsing.