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An example of the Scunthorpe problem in Wikipedia because of a regular expression identifying "cunt" in the username. The Scunthorpe problem is the unintentional blocking of online content by a spam filter or search engine because their text contains a string (or substring) of letters that appear to have an obscene or otherwise unacceptable meaning.
The simplest method involves spammers purchasing or trading lists of email addresses from other spammers.. Another common method is the use of special software known as "harvesting bots" or "harvesters", which uses spider Web pages, postings on Usenet, mailing list archives, internet forums and other online sources to obtain email addresses from public data.
A suppression list is a list of suppressed e-mail addresses used by e-mail senders to comply with the CAN-SPAM Act of 2003 (United States of America). [1] CAN-SPAM requires that senders of commercial emails provide a functioning opt-out mechanism by which email recipients can unsubscribe their email address from future email messages. [1]
Most email providers have an anti-spam feature that essentially blacklists certain email addresses if they are deemed unwanted. For example, a user who wearies of unstoppable emails from a particular address may blacklist that address, and the email client will automatically route all messages from that address to a junk-mail folder or delete them without notifying the user.
Shadow banning, also called stealth banning, hell banning, ghost banning, and comment ghosting, is the practice of blocking or partially blocking a user or the user's content from some areas of an online community in such a way that the ban is not readily apparent to the user, regardless of whether the action is taken by an individual or an algorithm.
As of late 2006, CAN-SPAM has been all but ignored by spammers. A review of spam levels in October 2006 estimated that 75% of all email messages were spam, and the number of spam emails complying with the requirements of the law were estimated to be 0.27% of all spam emails. As of 2010, about 90% of email was spam. [39] [40]
The Mail Abuse Prevention System (MAPS) is an organization that provides anti-spam support by maintaining a DNSBL. They provide five black lists, categorising why an address or an IP block is listed: Real-time Blackhole List (RBL), the one for which MAPS is probably best known. Dialup Users List (DUL), blocks of addresses that include many SOHO ...
Spam reporting, more properly called abuse reporting, is the action of designating electronic messages as abusive for reporting to an authority (e.g. an email administrator) so that they can be dealt with. Reported messages can be email messages, blog comments, or any kind of spam.