Spam also called junk email or bulk email can be defined as unsolicited e-mail, often of a commercial nature, sent indiscriminately to multiple mailing lists, individuals, or newsgroups. The intention is to frustrate the receiver and also to income money.
Due to the international nature of spam, the spammer, the hijacked spam-sending computer, the spamvertised server, and the user target of the spam are all often located in different countries.
Spamming is the abuse of electronic messaging systems to indiscriminately send unsolicited bulk messages. While the most widely recognized form of spam is e-mail spam, the term is applied to similar abuses in other media:
E-mail spam, also known as unsolicited bulk email (UBE) or unsolicited commercial email (UCE), is the practice of sending unwanted e-mail messages, frequently with commercial content, in large quantities to an indiscriminate set of recipients.Email spam targets individual users with direct mail messages. Email spam lists are often created by scanning Usenet postings , stealing Internet mailing lists, or searching the Web for addresses.
Usenet (a contraction of user network), is a world-wide distributed Internet discussion system. It was conceived by Duke University graduate students Tom Truscott and Ji Ellis in 1979. Users read and post public messages (called articles or posts, and collectively termed news) to one or more categories, known as newsgroup . Newsgroup spam is a type of spam where the targets are Usenet newsgroups.
can occur in any live chat environment like IRC and in-game multiplayer chat of online games, and in any other form of chat the masses are able to view. It consists of repeating the same word or sentence many times to get attention or to interfere with normal operations
WEB SEARCH ENGINE SPAM:
Spamdexing ( spamming and indexing ) refers to the practice on the World Wide Web of modifying HTML pages to increase the chances of them being placed high on search engine relevancy lists.
Image spam is an obfuscating method in which the text of the message is stored as a GIF or JPEG image and displayed in the email. Often, image spam contains nonsensical, computer-generated text which simply annoys the reader.
Blank spam is spam lacking a payload advertisement. Often the message body is missing altogether, as well as the subject line. Still, it fits the definition of spam because of its nature as bulk and unsolicited email.Blank spam may be originated in different ways, either intentional or unintentionally:
Some spammers have a business model that lets them make money as long as people simply visit their website. We don't need to sign up for a spammer's online site, for example, because just visiting their publicly available website will be enough to ensure that the spammer gets advertising revenue from banner ads displayed on those pages.
There are a variety of techniques that e-mail senders use to try to make sure that they do not send spam.
Background check on new customer or user
Since spammers are frequently kicked off the network, they are constantly trying to create new accounts. As a result, manISPs and web –email providers try to verify the credit cards are not stolen before accepting new customers
Confirmed opt in for mailing list:
If a user wants to be a subscriber of a product in the mailing list then the latter (the mailing s/w) sends a confirmation message to the user and after getting the response adds the user mail address to the list.
There are a number of proposals for sideband protocols that will assist SMTP operation.The Anti-Spam Research Group (ASRG) of the Internet Research Task Force(IRTF) isworking on a number of E-mail authentication andother proposals for providing simple source authentication that is flexible, lightweight, and scalable.