Uplance Monitor types Blocklist
Know the day your mail server gets listed
Uplance asks the five blocklists that actually decide whether your mail is delivered, and tells you the day your IP appears on one.
Free for 10 monitors · no credit card
The problem
Your mail server is running perfectly and half your messages are going nowhere, because the IP was listed after a compromised account sent for an afternoon.
Nobody tells you. Recipients don't bounce, they silently filter, and you find out when a customer mentions they never got the invoice.
What the check looks at
Five blocklists
Spamhaus ZEN, SpamCop, Barracuda, SORBS and PSBL — the ones large mail providers actually consult.
Which one listed you
The alert names the blocklists you are on, so you go straight to the right delisting form.
Refusals are not listings
A blocklist that declines to answer is recorded as a refusal, not as a listing — so you are never paged for a false positive.
By host or by IP
Give a hostname and it checks the address that resolves to; give an IP and it checks that.
And the alert actually arrives
Most monitoring tools are fine until the one time the alert doesn't arrive. Uplance is built so that can't happen quietly.
- Every alert is written to an outbox before it is sent, and retried for about fifty minutes. A restart doesn't lose it.
- Once a week, a real test event is sent through every channel you've configured, and you're told which ones failed.
- If the alert pipeline is in trouble, the dashboard says so — it isn't buried in a log file.
- If the checker itself stops, the health endpoint returns 503 so an outside heartbeat can page you, and your status page says monitoring has stopped instead of showing stale green.
Common questions
- Which blocklists are checked?
- zen.spamhaus.org, bl.spamcop.net, b.barracudacentral.org, dnsbl.sorbs.net and psbl.surriel.com. Those five cover the lists the big mailbox providers weigh most heavily.
- What do I do when it fires?
- Find and stop the source first — usually a compromised account or a forwarding loop — then use the named blocklist's delisting form. Delisting before the cause is fixed gets you relisted within days.
- Can it check the IP my newsletter is sent from?
- Yes, if it is an IP you send from. Add one monitor per sending IP, including any secondary or backup relay.
- Does a listing count as downtime?
- It opens an incident like any other failure, so it shows up in history and on your status page if you publish that monitor. Whether you want it public is your call, per monitor.
Also monitored
Know it's down before your customers do.
10 monitors, 30 days of history, no credit card