What happens when your domain is put on a blocklist?
Michael Ko
Co-founder & CEO, Suped
Published 25 Jun 2025
Updated 25 Jun 2025
1 min read
It's a feeling many email marketers and business owners dread. You're sending emails as usual, but your open rates have suddenly plummeted. Your support team is getting messages from users who aren't receiving password resets or order confirmations. You start to investigate, and the evidence points to a scary conclusion: your domain is on a blacklist.
Being on a domain blocklist (or blacklist) means your domain has been flagged as a source of spam or malicious activity. As a result, major mailbox providers like Gmail, Outlook, and Yahoo will start filtering your messages directly to the spam folder or blocking them entirely. This can feel like your business's lifeline has been cut, but understanding what happens if your domain is blacklisted is the first step toward fixing the problem and protecting your sender reputation.
0.0
What's your domain score?
Deep-scan SPF, DKIM & DMARC records for email deliverability and security issues.
Start monitoring your DMARC reports today
What you'll get with Suped
Real-time DMARC report monitoring and analysis
Automated alerts for authentication failures
Clear recommendations to improve email deliverability
