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How to Delist from SORBS Spam Blacklist
4 min read
The SORBS (Spam and Open Relay Blocking System) spam blacklist is a database that flags IPs or domains sending spam or exhibiting suspicious email activity. If your IP or domain is listed on SORBS, follow these steps to request delisting.
For closely related blacklist topics, see BlacklistAlert — Understanding and Resolving, 550 5.7.1 Spamhaus Client Host Blocked, BlacklistAlert.org Tool, and SpamRL Blacklist Configuration.
Understand Why You Are Listed
Common Reasons for Blacklisting
- Sending spam or bulk emails.
- Hosting an open relay email server.
- Compromised email accounts or servers.
- High volumes of bounced or undelivered emails.
Check Your Listing
- Visit the SORBS website: https://www.sorbs.net/.
- Use their "Search for Listings" tool to enter your IP address or domain and confirm the listing.
Resolve the Issue
Before requesting delisting, fix the underlying problems that caused the listing.
Investigate the Cause
- Analyze Email Logs: Review mail server logs to identify unauthorized or excessive outgoing emails.
tail -f /var/log/mail.log - Scan for Malware: Use tools like ClamAV to scan your server for malware or malicious scripts.
- Check for Open Relay: Ensure your mail server is not an open relay by testing with tools like MXToolbox.
Fix Misconfigurations
- Set Up Email Authentication:
- SPF: Authorize sending servers.
v=spf1 include:_spf.example.com ~all
- DKIM: Digitally sign your emails.
- DMARC: Enforce email authentication policies.
_dmarc.example.com TXT "v=DMARC1; p=reject; rua=mailto:reports@example.com"
- SPF: Authorize sending servers.
- Rate Limit Outbound Emails: Limit the number of emails sent per hour to prevent spam-like behavior.
- Clean Your Mailing List: Remove invalid, outdated, or spam trap addresses.
Request Delisting from SORBS
Register on the SORBS Portal
- Go to the SORBS website: https://www.sorbs.net/.
- Create an account by providing your contact details and email address.
Submit a Delisting Request
- Log in to the SORBS portal.
- Navigate to the Delisting section.
- Provide the following:
- Your IP address or domain name.
- A description of the issue and how it was resolved.
- Evidence of issue resolution (e.g., updated SPF/DKIM/DMARC records, clean email logs).
Pay Any Required Fees
SORBS may charge a fee for manual delisting in some cases. Review their policies and provide payment if applicable.
Wait for Confirmation
SORBS typically reviews requests within 48?72 hours. You will receive an email notification once your delisting request is processed.
Prevent Future Listings
Monitor Your Domain Reputation
Use tools like MXToolbox, Google Postmaster Tools, or Microsoft SNDS to monitor your IP/domain reputation.
Regularly Audit Your Mail Server
Ensure email authentication records are updated and functioning. Scan for malware and suspicious activity frequently.
Educate Email Users
Encourage strong passwords and safe email practices among your users.
Monitor Outgoing Emails
Set alerts for unusually high email volumes or unauthorized access attempts.
Example Delisting Request Letter
Subject: Request for Delisting of [Your IP Address/Domain]
Dear SORBS Team,
I am writing to request the removal of my IP address/domain ([Your IP/Domain]) from your blacklist. After identifying the issue, I have taken the following corrective actions:
- Cause of Listing: [Brief explanation, e.g., compromised email account or SPF misconfiguration].
- Actions Taken:
- Updated email authentication records (SPF, DKIM, DMARC).
- Secured email accounts by resetting passwords and enabling two-factor authentication.
- Scanned and removed malware from the server.
- Implemented rate limiting on outbound emails.
Please let me know if additional information is required to process this request. Thank you for your assistance.
Best regards,
[Your Name]
[Your Email Address]
[Your Organization]
By resolving the root cause of the listing and following SORBS delisting process, you can restore your domain or IP reputation and ensure smooth email deliverability.
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