Editing Anti-spam techniques (section)

===Tarpits===
{{Main|Tarpit (networking)}}

A ''tarpit'' is any server software which intentionally responds extremely slowly to client commands. By running a tarpit which treats acceptable mail normally and known spam slowly or which appears to be an open mail relay, a site can slow down the rate at which spammers can inject messages into the mail facility. Depending on the server and internet speed, a tarpit can slow an attack by a factor of around 500.<ref>{{Cite book|title=Mastering Microsoft Exchange Server 2016|last1=Leonard|first1=Clifton|last2=Svidergol|first2=Brian|last3=Wright|first3=Byron|last4=Meloski|first4=Vladimir|date=2016|publisher=John Wiley & Sons|isbn=9781119232056|location=Hoboken, NJ|pages=630}}</ref> Many systems will simply disconnect if the server doesn't respond quickly, which will eliminate the spam.  However, a few legitimate email systems will also not deal correctly with these delays. The fundamental idea is to slow the attack so that the perpetrator has to waste time without any significant success.<ref>{{Cite book|url=https://books.google.com/books?id=YQmWtsqlvfMC&q=tarpit&pg=PT199|title=Virtual Honeypots: From Botnet Tracking to Intrusion Detection|last1=Provos|first1=Niels|last2=Holz|first2=Thorsten|date=2007-07-16|publisher=Pearson Education|isbn=9780132702058|language=en}}</ref>

An organization can successfully deploy a tarpit if it is able to define the range of addresses, protocols, and ports for deception.<ref name=":0">{{Cite book|title=Introduction to Information Security: A Strategic-Based Approach|last1=Shimeall|first1=Timothy|last2=Spring|first2=Jonathan|date=2013|publisher=Syngress|isbn=9781597499699|location=Waltham, MA|pages=74}}</ref> The process involves a router passing the supported traffic to the appropriate server while those sent by other contacts are sent to the tarpit.<ref name=":0" /> Examples of tarpits include the Labrea tarpit, Honeyd,<ref>{{Cite book|title=Honeypots: A New Paradigm to Information Security|last1=Joshi|first1=R. C.|last2=Sardana|first2=Anjali|date=2011|publisher=CRC Press|isbn=9781439869994|location=Boca Raton, FL|pages=252}}</ref> SMTP tarpits, and IP-level tarpits.