Blacklist monitoring across 14 sources is live
Daily checks against the 14 blacklists that actually affect cold-email deliverability. Per-domain, per-mailbox visibility.
Rejwan Nirob·Dec 8, 2025·3 min readToday's release adds blacklist monitoring to every mailbox and domain in your Inboxlee workspace. Daily checks across 14 sources, surfaced as a clean trend on the dashboard.
Sources monitored
- Spamhaus (SBL, XBL, PBL)
- SURBL
- URIBL
- Barracuda
- SpamCop
- SORBS
- Mailspike
- NixSpam
- WPBL
- Other reputation-impacting sources monitored daily
Why these specifically
There are over 100 blacklists publicly tracked. Most have negligible impact on cold-email placement. The 14 we monitor are the ones with measurable impact on Gmail, Workspace, M365, and Yahoo. Listings on these sources directly correlate with placement decline in our partner-program telemetry.
How alerts work
A new listing on any monitored source triggers an immediate dashboard alert and an optional email or webhook. The alert includes the source, the affected domain or IP, and a recommended remediation path (delisting, sender pattern review, mailbox suspension if compromise is suspected).
Frequently asked
Which email blacklists actually matter for cold email?
About 14 with measurable impact on Gmail, Workspace, M365, and Yahoo placement: Spamhaus (SBL, XBL, PBL), SURBL, URIBL, Barracuda, SpamCop, SORBS, Mailspike, NixSpam, WPBL, and a handful of others. The other ~85 publicly tracked blacklists have negligible deliverability impact. Inboxlee monitors all 14 daily.
How does Inboxlee blacklist monitoring work?
Daily automated checks across the 14 sources for every domain and IP in your workspace. A new listing triggers an immediate dashboard alert plus optional email or webhook. The alert includes the source, the affected resource, and a recommended remediation path (delisting submission, sender-pattern review, mailbox suspension if compromise is suspected).
What should I do if my cold-email domain gets blacklisted?
Three immediate steps: pause sending from the affected domain, submit a delisting request to the listing source (Spamhaus has the highest impact and a working delisting form), and audit recent campaigns for the trigger (list quality, sudden volume, content patterns). Most delistings clear within 1 to 7 days. Sustained reputation damage may require a 30-day recovery playbook.
Does an IP blacklist hurt me if I am on shared infrastructure like Google Workspace?
IP blacklists matter much less for shared SaaS senders because Workspace and M365 share IPs across thousands of tenants - the IPs are already trusted by major receivers regardless of any single tenant's reputation. Domain blacklists (Spamhaus DBL, SURBL) are what cold-email operators on shared infrastructure need to watch.