Our investigators research thoroughly, checking multiple characteristics to determine if an IP space appears to be static or dynamic within an ASN. IP space that gets added to the DUL database is either obviously dynamic or the ISP has failed to provide the proper information to the public. Characteristics such as; rDNS, SWIP, Whois, MX and A Records, are just a few attributes examined. Incorrect or missing data can result in inclusion in the DUL database.

There are several reasons why an IP address may need to be removed from the MAPS DUL.

	Removal due to network reorganization
	Removal due to network inheritance
	Removal due to listing error

We will only remove IP addresses at the request of the responsible owner of the IP space. This is typically an ISP or network operator who is the registered owner of the ASN.

To request an IP address be removed from the MAPS DUL, you may contact us via email or our web form. Please include details regarding why your IP address(es) should be removed:

Email:   dul@mail-abuse.com
Webform:  http://www.mail-abuse.com/lookup.html

ISP Process for Removal From The DUL

For ISPs requesting removal of IP addresses from the DUL, you will need to do the following:

1. Submit your request directly to dul@mail-abuse.com from an authoritative account such as: abuse@(domain name) or postmaster@(domain name). This will allow us to ensure we are in contact with the responsible owner of the IP block(s). NOTE: Please DO NOT send this request using the web form as it will not show you as authoritative.
2. In your request, please include the following information in reference to the ASN(s) you control: (these must be 3 separate lists)
   • Total allocated IP space in CIDR format.
   • Total dynamic IP space in CIDR format.
   • Total static IP space in CIDR format.

Once we have determined we are corresponding with the responsible party and we have the required information, we can begin the process of updating the database. Our goal is to provide accurate information in a timely manner. Failure to supply all information requested will only slow the process.

By providing this information ISPs can reduce and control the spam coming from their network. It also enables us to maintain a properly updated database as specified by the ISP.

Please note: We can only request that ISPs share this information regarding their IP space with us, but at the same time, we will manage our list as we see needed. Our subscribers do not wish to receive email from dynamic IP addresses or those that appear to be.

We appreciate your cooperation.

Removal due to network reorganization
If an ISP, especially a smaller one with a single or more Class C networks to its name, reorganizes its IP address pool so its fixed servers and dial-ups change places, they may not be able to send mail normally due to their mail servers occupying former dial-up IPs listed in the MAPS DUL. We will remove the fixed servers from the DUL at minimum, or the whole network if no dial-up or dynamic IP addresses exist. When you contact us, you will need to supply us with a new list of your dial-up networks or state that you no longer have dial-up or dynamic IP addresses.

Before you submit such a request, please ensure you updated your forward and reverse DNS records in case we need to verify the network for removal. Note that updating your DNS records will also avoid problems with other anti-spam initiatives outside of MAPS, and with mail servers that verify the name records before accepting mail.

Removal due to network inheritance
If you get an address pool formerly containing dial-ups, they may be still listed with the MAPS DUL and you may find you can't send mail to MAPS DUL users. If this is so, please contact us so we can remove the listing.

Please update your forward and reverse DNS records in case we need to verify the changes.

Removal due to listing error
Because real people maintain the MAPS DUL, mistakes occur. We make every effort to ensure we don't include fixed hosts, especially SMTP servers, in this list. But don't let that stop you from writing us if you think we made a mistake. Remember that the MAPS DUL is not for listing open relays or blackholing "spam houses"; that is a matter for the MAPS RBL. The MAPS DUL is for identifying dynamically assigned IP pools where trespass spam occurs.

When reporting a mistake, please include a sample of the bounced message or error message you received, and the IP address of the server that refused your mail due to your being listed on the MAPS DUL. It may be possible they have a cached entry not yet cleared due to a removal, or they are blocking your mail for a different purpose yet are citing the MAPS DUL. We'll try to contact the site's owner if they are blocking mail from non-DUL-listed networks yet are citing the MAPS DUL.