Email Blacklist Check
Check whether your email server's IP address is listed on major DNS-based blacklists (DNSBLs). A blacklisted mail server can cause your emails to be rejected or marked as spam by recipients.
What Is an Email Blacklist Check?
An email blacklist check verifies whether the mail server (MX record) associated with your email address is listed on DNS-based blackhole lists (DNSBLs). When your mail server's IP is blacklisted, emails you send may be rejected by recipient servers or automatically routed to spam folders. This tool resolves your email domain's MX records, determines the mail server IP, and checks it against the most widely used blacklists.
Why Is Email Server Reputation Important?
Email deliverability depends heavily on your mail server's reputation. If your server IP is listed on even one major blacklist, a significant percentage of your emails may never reach their intended recipients. Regular monitoring helps you detect blacklisting early, allowing you to address the root cause (compromised accounts, spam complaints, or misconfigured servers) before it significantly impacts your business communications.
Frequently Asked Questions
The tool extracts the domain from your email address, looks up its MX (Mail Exchange) DNS records to find the mail server hostname, resolves that hostname to an IP address, and then checks that IP against multiple DNS-based blacklists (DNSBLs).
First, identify why your server was blacklisted — common causes include compromised email accounts sending spam, misconfigured mail servers acting as open relays, or high spam complaint rates. Fix the root cause, then visit each blacklist's website to request delisting.
Delisting times vary by provider. Some blacklists like SpamCop automatically delist IPs after 24-48 hours of clean behavior. Others like Spamhaus may require a manual delisting request and can take 1-7 days to process.
Yes, you can check any email address. The tool only needs the domain part (after @) to look up MX records. It does not send any emails or verify the mailbox itself — it only checks the mail server's IP reputation.
MX (Mail Exchange) records are DNS records that specify the mail server responsible for receiving email for a domain. When someone sends an email to your domain, their mail server queries DNS for your MX records to determine where to deliver the message.
Blacklisting is just one factor in email deliverability. Other factors include SPF, DKIM, and DMARC authentication, email content quality, sending volume patterns, recipient engagement rates, and domain age/reputation.