Question 1

How fast does SenderSignal detect a new blacklist listing?

Accepted Answer

P50 detection latency is 8.3 seconds across our 14-region edge. We probe every monitored source every 60 seconds, rotating through them so no single source can throttle us.

Question 2

Which blacklists does SenderSignal monitor?

Accepted Answer

Over 150 sources including Spamhaus tiers (DBL, SBL, CSS, PBL, XBL, ZEN), Barracuda, Invaluement, SORBS, URIBL, surbl, and many more DNSBLs and URIBLs.

Question 3

Where do alerts get delivered?

Accepted Answer

Slack, Microsoft Teams, PagerDuty, Discord, email, SMS, and HMAC-signed webhooks. You can route alerts by severity, domain, and source.

Sign in to SenderSignal