DNSBL Monitoring (Beta)

Status: Lab This feature is currently in the Lab phase. This means we are still actively optimizing intervals and the selection of lists.

DNSBL (DNS-based Blocklist) Monitoring regularly checks whether your server's IP address is listed on one of the known "Blacklists" (Blocklists/RBLs). Being listed on such a list often has serious consequences for email delivery (mails land in spam or are rejected).

How it works

We use our own open-source engine uptimeify-dnsbl to check your IP address against over 50 international spam databases.

Check Interval

Currently, we perform the check every 180 minutes (3 hours).

Reason: DNSBL operators often block excessive queries ("Rate Limiting"). A 3-hour rhythm is a good compromise between timeliness and "Good Citizenship" towards list operators.
Note: If there is a real need for more frequent checks, please contact us.

What happens if a match is found?

If we find your IP on a list (e.g., Spamhaus, Barracuda, SORBS):

Notification: You receive an alert via your configured channels.
Details: We show you the specific reason (e.g., "Listed in SBL" or "Dynamic IP Range").
Solution: Where available, we provide a direct Delisting Link through which you can request removal from the list operator.

Supported Lists

We query a curated list of reliable providers. A complete overview can be found on the page Used Lists.