MX Radar

Round-the-clock watch on your mail servers' IP, DNS blacklist status and TLS certificates — with alerts the moment something breaks.

IP change detection

Every check resolves your mail server's current IP and flags it the moment it moves — often the first sign of a migration gone wrong or a hijack.

Pick from dozens of DNSBL zones, weighted High/Medium/Low, and get notified the moment your IP shows up on one — before it hurts deliverability.

SMTP, IMAP, POP and HTTPS ports checked for a valid, matching, non-expiring certificate — with a heads-up 14 days before anything lapses.

Email, SMS, Pushover or a webhook — pick any combination of verified channels per server, no complicated profile setup.

Check daily, every 8 hours, or hourly — pick the tier that matches how critical each server is, per server.

Every IP change, blacklist add/remove, and certificate event is logged so you can see exactly what happened and when.

sysbox.io/mxmonitor-list

mail.example.com

Primary mail server

gold

Clean Valid Stable

mx2.example.com

Backup relay

silver

1 listing Valid Stable

A real view from the MX Radar dashboard — example data shown.

Usage-based, billed monthly in arrears. No card required for the first 2 servers, 15 days.

Bronze

0.15 CHF / server / day

Checked daily — good for low-priority or backup servers.