The SORBS "spam" sub-list contains IP addresses reported specifically for sending unsolicited email, as opposed to the open-relay or dynamic-range portions of SORBS.
Why an IP gets listed on SORBS Spam
Blocklists add an IP when they see evidence of spam or abuse from it: mail hitting spam traps, a compromised server sending on behalf of a botnet, an open relay or proxy, or a sudden spike in unsolicited mail. Shared hosting and cloud IPs can also inherit a bad reputation from a previous tenant. It has moderate adoption; a listing may affect some receivers but rarely causes a broad delivery failure on its own.
How to delist from SORBS Spam
To delist from SORBS Spam: first fix the underlying cause (secure the host, stop the offending mail, close any open relay or proxy), then submit a removal request through the official form:
Delisting only sticks if the root cause is fixed first. Run the full Mail Health Report to catch the SPF, DKIM, DMARC or reverse-DNS problems that often cause listings.
Frequently asked questions
How do I check if my IP is on SORBS Spam?
Enter your mail server's IP address (or your domain) in the checker above. It queries SORBS Spam live and tells you immediately whether the IP is listed, along with how many other blocklists list it.
How long does it take to get delisted from SORBS Spam?
Once you have fixed the underlying issue and submitted the removal request, SORBS Spam typically processes delisting within a few hours to a few days.
Will a SORBS Spam listing stop my email being delivered?
It has moderate adoption; a listing may affect some receivers but rarely causes a broad delivery failure on its own.