How to Get Delisted from s5h.net All Blocklist
How to get delisted from s5h.net — a blocklist targeting open relays, open proxies, and spam sources.
Removal Method
Email-based removal request after fixing open relay or proxy
Time to Removal
24-72 hours after email request is processed.
Overview
s5h.net (all.s5h.net) is a DNS-based blacklist maintained by a UK-based operator. It lists IPs associated with open mail relays, open proxies, and confirmed spam sources. While not as widely used as Spamhaus or Barracuda, s5h.net is referenced by some mail servers and SpamAssassin configurations.
Why You Might Be Listed
- 1Your IP is running an open mail relay that forwards email without authentication
- 2An open proxy on your server allows unauthenticated connections
- 3Your IP was detected as a direct spam source
Step-by-Step Removal
Check your listing
Visit usenix.org.uk/content/rbl.html to learn about the s5h.net list and check your IP's status using a DNS lookup against all.s5h.net.
Fix open relays and proxies
If your server is an open relay, configure it to require authentication for sending email. If an open proxy is detected, close it or restrict access. Verify your fixes using an open relay testing tool.
Email a removal request
s5h.net handles removal requests via email. Send a message to the address listed on their website explaining that you have fixed the issue and requesting removal of your IP.
Verify after removal
After your IP is removed, test your mail server configuration to confirm that open relay and proxy issues are resolved. Monitor for relisting.
Official Removal Portal
http://www.usenix.org.uk/content/rbl.htmlImportant Tips
- ●Test your mail server for open relay using an external tool like mxtoolbox.com/diagnostic.aspx before requesting removal.
- ●s5h.net has moderate impact — if you are listed on multiple blacklists, prioritize Spamhaus, Barracuda, and CBL first.
- ●Ensure your mail server requires SMTP authentication for all outbound relay attempts.
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