What is spam.blackhole.cantv.net?
spam.blackhole.cantv.net is a list maintained by Cantv.net, that contains IP addresses of the sources of bulk, non-solicited email, which is in principle our definition for spam.
An IP address can get into spam.blackhole.cantv.net for various reasons, among which are:
We've received complaints about bulk, non-solicited email, originated in the listed IP address.
Cantv.net has received evidence where the listed IP space has been the source of bulk, non-solicited email towards other networks.
The rest of this page answers frequent questions. Please review the corresponding sections below, for additional information.
My mail bounces with a mention to spam.blackhole.cantv.net... Is there any problem?
Yes. If your mail is bouncing with a mention to spam.blackhole.cantv.net, this means that one or more of the IP addresses involved in delivering your email, have been associated with the sending of bulk, non solicited email to our network. This is contrary to our Terms of Use and our Technical Requirements.
We're not stating that you send spam or non solicited email. We're simply expressing our preference of not receiving further email messages from sources that have been listed, until the problem that originated such listing is corrected.
If you're an end user and observe that your mail is bouncing, with a message referring you to this page, it is a good idea to let your system administrator (or Internet Service Provider) know about this problem, since usually that is the only party who can take actions to solve the problem.
Is my IP address listed in spam.blackhole.cantv.net?
If you were referred to this page, this is very likely. To make sure, write the name or IP address of the server or servers you wish to verify in all of our lists, in the space provided below.
Is my domain listed in spam.blackhole.cantv.net?
No. This list never includes domains, but IP addresses. It is possible that your domain is being served from a shared server, from which the hostile activity was originated. We regret this situation, but the common practice shows that the only way to effectively protect our platform and our users, is to restrict access to IP addresses.
We're sorry for the discomfort this might cause you, and suggest that you direct your complaints about this situation, to the administrator of your own service or server as he or she is the only one responsible for this situation. Additionally, it is unlikely that Cantv.net is the only network that has taken any action as this one, as many networks block sources of abuse but lack a clear policy or tell the community what did they do.
How do I get out of spam.blackhole.cantv.net?
To get out of this list, you must comply with the following requisites.
Explain Cantv.net the causes that generated the sending of non-solicited mail in the first place.
Explain Cantv.net which controls will you be implementing, in order to avoid this incident in the future.
If your IP address does not have a valid inverse (IN PTR resource record in the DNS), you must configure it. Cantv.net won't make any change without compliance with this requisite.
Configure the role accounts abuse@ and postmaster@ in your domain.
In case of appearing in public mail filtering lists (see OpenRBL), What are you doing to resolve that situation?
If your domain is not registered in www.abuse.net, When are you planning your registration?
If your WHOIS information is incomplete or incorrect, When are you planning to fix or update it?
Once you're ready to supply all of this information, use this page to contact us. Do not forget to state clearly, the IP address of the listed server and the relevant fragment of the error message. In case of using email to provide us with this information, please do not encrypt it with HTML.
Requests that do not contain complete information, only serve to delay the processing of the case. If all the information is complete, usually the removal will happen within the same working day in which it is requested. This time can be influenced by the lapse ocurred between the insertion on the list and the request for removal, as evidence needs to be archived.
For mailing lists, you must be prepared to prove the confirmation from the email address to which you sent your material, in case that Cantv.net requests this information.
Can you provide some evidence showing the unsolicited email?
Entries in spam.blackhole.cantv.net are backed by at least one of these clases of evidence:
Messages either reported by our users as non-solicited or captured in our spamtraps. In these cases, the spam is sent to the abuse contact, as designated by the WHOIS information published by the administrator of the source netblock.
Public records, in which the affected IP addresses are or have recently been, a significant source of bulk, non-solicited email.
If you request a new copy of the evidence, either because you did not receive it or because you lost it, we will gladly send it again if requested through this page. We will send it to abuse@ and postmaster@ in your domain. However, any bounce will be reported, automatically and with no exceptions, to www.rfc-ignorant.org for processing.
Another option, is our automated tool that allows you to find the evidence for a given IP address. You can also access this tool easily while doing a lookup in our lists.
Such a large ISP won't contact Cantv.net
The size of an ISP has no relation with its level of responsibility or the quality of its customer service. Cantv.net has received communications from ISPs with more and less users. Cantv.net also has served smaller ISPs, both with sending and receiving complaints.
The argument that "a large ISP won't talk to a smaller one" is self-imposed most of the time. When this is the effective answer from a customer service center, it is worth questioning wether the "big" ISP doesn't want to involve in the matter because it does not have the necessary controls or resources in place.
My IP address was listed due to an anti-virus warning
We're perfectly aware that because of your good intentions, you might have configured your anti-viral software to notify the sender whenever a message with questionable content is blocked. However, this is a configuration that we consider unacceptable nowadays, because one or more of the following reasons.
Block notification messages are massive in nature and mostly unsolicited. This makes them spam.
Notification messages add up to the load of processing the contaminated messages themselves, so twice the number of messages must be processed.
When notification messages are delivered to email addresses that have nothing to do with the sending of the contaminated messages, third parties are exposed to collateral damage and the processing overhead of these messages.
Users receiving notification messages that claim they sent contaminated messages, get confused and end up requesting support to remove an unexistant virus or worm from their computers. The worries to the user and the cost to provide said support are totally unnecesary and increase the price this user has to pay for his or her Internet access.
Because all of this, Cantv.net considers more than appropiate to process the mentioned notification messages, as spam. This same practice is frequently applied by other ISPs.
Can I use your list in my servers?
Cantv.net does not publish its lists or allow third parties to use them at this time.
