Sender Reputation

Free Blacklist Checker

Check whether a domain or public IP appears on common DNS-based blacklists and review deliverability risk.

Reputation signal check

Blacklist status is one signal in deliverability, not a guarantee of inbox placement.

Blacklist guide

Monitor reputation before important outreach

DNS-based blacklists can flag IPs associated with unwanted or unsafe sending behavior. A listing can affect deliverability, especially when it involves mail server IPs.

DevBoxy helps teams monitor blacklist status alongside SPF, DKIM, DMARC, MX, and full domain health signals.

Related tools

Domain Health Checker SPF Checker DKIM Checker DMARC Checker MX Checker Email Header Analyzer

FAQ

What is an email blacklist?

It is a DNS-based list that identifies IPs associated with reputation or abuse concerns.

Why is my IP blacklisted?

Common causes include compromised systems, high bounce rates, complaint patterns, or shared infrastructure issues.

Does blacklist status affect deliverability?

It can. Blacklist status is one signal providers may consider along with authentication and reputation.

How do I remove my IP from a blacklist?

Fix the root cause first, then follow the listed provider's delisting process.

Should I check domain or IP?

Check the domain to discover related A and MX IPs, or check a specific public IP directly.

Does a clean result guarantee inbox delivery?

No. Clean blacklist status is helpful, but delivery depends on many authentication and reputation factors.