Blacklist Check
One bad listing and your mail starts landing in spam. Drop in an IP or domain and we'll check it against Spamhaus and other DNSBL/RBL blocklists, plus SSL, domain expiry, and SPF/DMARC. Free, and it takes a few seconds.
What we check
- Blacklists (DNSBL/RBL) — Spamhaus plus a hand-picked set of blocklists that mail servers actually honor.
- SSL — whether the cert is valid and how many days you have before it expires.
- Domain — when the registration lapses.
- SPF / DMARC — authentication records on domains, and rDNS/PTR on IPs.
Show up listed? Do this
Even one listing can tank delivery the same day. Here's how to get your IP off Spamhaus, and the wider deliverability checklist if mail is already hitting spam.
Checking once won't cut it
You rarely get a heads-up before a listing lands. Deliveradar re-checks your IPs and domains around the clock and pings you on email and Telegram the moment one shows up.
Let us watch your reputation for you
We'll catch the listing the moment it happens, so you fix it before your delivery numbers do the talking.
Start monitoring, freeFree plan, no card, no expiry.