SORBS

SORBS (Spam and Open Relay Blocking System) is one of the oldest and most comprehensive DNS blacklists. It maintains multiple sub-lists for different types of abuse including spam, open relays, dynamic IPs, and web exploits.

Tier

Widely used

Impact

Medium-High — Widely referenced by email filters and ISPs. Multiple sub-lists target different abuse types.

Auto-expiry

Varies by sub-list. Some require manual removal requests.

What it lists

Spam sources, open relays, open proxies, dynamic/residential IPs, and web exploit sources.

How to get delisted

5 steps

01Visit the SORBS lookup page and check your IP
02Identify which specific SORBS sub-list you appear on
03For spam listings: Stop the spam source and request removal
04For DUL (dynamic IP) listings: Set up a proper reverse DNS (PTR) record
05Follow SORBS' specific delisting procedure for your listing type

Open the removal formhttp://www.intl.sorbs.net/cgi-bin/lookup

What it lists

How to get delisted

Check SORBS against your domain