A Free DNSBL for Mail Servers | The 0spam Project

How much does it cost?

Nothing. The 0Spam Project is absolutely free for email providers, IT professionals and general removal request.

If its free, how do you make money to support the project?

The 0Spam primary source of support comes in the form of donations to the project. Each donation helps us improve the platform and add additional functionality improving spam detection and false positive awareness.

The Project also offers additional services, including:

• IP Notification Services: $100/IP or $500/IP Block[max Class-C] (One Time Fee)
  This Service allows Network Administrators to be notified each time an IP that they manage is listed in the 0spam database. Confirmed network administrators are granted a 24 hour grace period before listings go live. However, repeated abuse of this feature will result in permanant rejection from the IP Notifiation services.
• IP Management Access: (currently free and available to IP Abuse Contacts only)
  You must be the official IP abuse contact in order to use this service which is currently in beta. The service allows you to see the current status for all IP's within your control in one easy to see menu.

How does the 0spam service work?

Any time spam is sent to our spam traps, an IP will be listed in the 0spam dnsbl(bl.0spam.org) with the data code of 127.0.0.# and if multiple trap hits are being detected from a single Class C set of IP's the block will be listed in the 0spam Network DNSBL(nbl.0spam.org).

Why 0spam?

• Better than .9997 average spam catch rate.
• Better than .00032 false positive rate.

We've combined machine learning to an intelligent anit-spam design in order to build the 0spam project.

New* Features:

1. Abuse notifications to the Regional Internet Registries(RIR) whois abuse contacts for each IP address found to be sending spam. Abuse contacts are the official IP abuse contact as designated with IP allocations from AFRINIC, APNIC, ARIN, LACNIC and RIPE.
2. IP Notification service.

How do I utilize "Zero Spam Project" DNSBL for free? 

Limited to 1,000 requests/second

1. Go to the DNSBL configuration area for your mail server or antispam module
2. Set the query domain to "bl.0spam.org" or in some cases "bl.0spam.org." depending on your mail server required configurations.
3. Set the query type to "DNS" or "A"
4. That's it, you're done.

How to use the "Zero Spam Project" URL-DBL for free(limit of 1,000 requests per second):

1. Go to the URL-DBL configuration area for your mail server or antispam module
2. Set the query domain to "url.0spam.org" or in some cases "url.0spam.org." depending on your mail server required configuration perameters.
3. Set the query type to "URL"
4. That's it, you're done.

How to use the "Zero Spam Project" DNS-Whitelist for free(limit of 1,000 requests per second):

1. Go to the DNS White list configuration area for your mail server or antispam module
2. Set the query domain to "wl.0spam.org" or in some cases "wl.0spam.org." depending on your mail server required configuration perameters.
3. Set the query type to "WhiteList", "DNS WhiteList"
4. That's it, you're done.

The wl.0spam.org lists IP's for trusted senders. Be sure to only place this in your mail server white list configuration or you will have lots of issues.

High traffic Usage

If you think your servers periodically go over 1,000 requests per second you can still use our service, but be aware our servers will ignore the requesting IP for a period each time requests exceed 1,000 per second and your servers will not be protected using the "Zero Spam Project" service during that time.

If you operate high traffic mail server(s) and consistently exceed 1,000 request per second limit or want access to our professional dnsbl services please contact us by selecting "Service Request" in the form to the right to request unrestricted access to our dnsbl servers for the best anti-spam results.

Premium access in access of greater than 1,000 query requests/second is available for for a monthly fee of $200 per 1,000/second.

Why is my IP/IP Range listed in the 0spam database?

Your computer/server or a previous user of this IP sent spam to a trap. Please scan your computer/server for malicious software and verify that senders from this IP are not using poor sending practices.

Listed with Data result 127.0.0.#
Listed with Data result 127.0.#.0

# Codes are as follows: (ie. General spam single IP result 127.0.0.1 )

1. general spam, Sending spam to our spam traps.
2. Removal request made but missing required information, please make a new request and be sure to complete the form properly.
3. Does not follow valid can-spam rules for newsletters / lists.
4. Not RFC compliant, server errors or improper configuration.
5. Repeat offenders, these are IP's that have been removed and listed again (3) or more times in a short period of time.
6. Bouncing email to the wrong server, NON RFC compliant configurations.
7. Relay or Open relay with reports of spam.
8. bouncing spoofed emails, you need to disable bounce of spoofed emails in order to get de listed.
9. Fraud/Scam emails, malware or illegal/abusive content.

Computer(s) and/or server(s) within your IP range have sent spam to our traps.

Most listing will be single IP listings(127.0.0.#) however when spam from a class C IP range hits a certian threshold a full class C block occurs. The following is outlined steps to prevent further spam which you should follow for removal.

How to remove your IP from the "Zero spam" project DNSBL:

• Scan your computer(s)/server(s) for malicious software
• If it is a class C IP range you will need to notify your IP provider so they can contact other users in your class C IP range to prevent further abuse.
• If you run a newsletter/emailing service, you should verify that your users are following a verified opt in subscription model.
• If you have a stand alone server verify you are not purchasing email lists, this is how you were most likly listed.
• If you provide free email service to unverified users you should limit sending to no more than 200 emails a day in order to prevent abuse and listing.

Request Types:

Removal - For reporting a fix on your server and requesting it be removed from our black listing service.

You must provide an explanation of what has been done to make sure we do not receive reports of spam from your IP Address/Range in the future. IMPORTANT!
You should verify that your system is not compromised or open to relay.
You should Check your IP with other black lists at the complete DNSBL check.
Verify that your dns records are setup properly, an example of a proper dns report should look like this.

Other - Other reports that do not apply to any of the above or if you would like to support the 0spam project.
Service Request - 0spam provides premium anti-spam services, please use this option to request premium anti-spam.