Spam and Open Relay Blocking System (SORBS) Spam blacklist


The Spam and Open Relay Blocking System (SORBS) Spam blacklist reports either single IP addresses or entire ranges that have actually sent spam and unsolicited bulk email to SORBS spam traps. It blocks email from host servers that distribute spam, phishing attacks, and other malicious forms of email.

  • Listings occur at the single IP and IP range level.
  • The impact on deliverability is low.

Reasons for getting listed

IP addresses are listed for:

  • Sending spam
  • Sending spam from compromised accounts
  • Sending spam generated by viruses, malware, trojans, or botnet infections in a network
  • Open relays

How to get off this blacklist

This blacklist accepts manual requests to remove IP addresses. First you need to register for an account with SORBS. Then you can look up IP addresses and netblocks in the SORBS database and open support tickets.

If you are eligible, you can manage your own networks and listings, and even remove your own IP addresses.

Tips for staying off this list

  • Maintain strict security on your sending IP addresses
  • Monitor your mail for unknown campaigns
  • Monitor feedback loops for increases in complaints
  • Make sure your servers are properly configured and have no open relays
  • Audit your email program to make sure you are CAN-SPAM compliant
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