Spam and virus protection Definitions

  • B

    backscatter spam

    Backscatter spam, also called misdirected bounce spam or NDR spam, is a strategy for sending unsolicited email messages that takes advantage of the fact that certain types of mail transfer agent (MTA) programs return the entire message to the sender when a recipient's email address is invalid.

  • blackhole list (blacklist)

    A blackhole list, sometimes simply referred to as a blacklist, is the publication of a group of ISP addresses known to be sources of spam, a type of e-mail more formally known as unsolicited commercial e-mail (UCE).

  • E

    edge transport server

    Edge transport server is an Exchange Server 2010 role that helps route Internet email as well as protect the Exchange organization from viruses and spam.

  • F

    FOPE (Forefront Online Protection for Exchange)

    FOPE (Forefront Online Protection for Exchange) is a discontinued cloud service for organizations using Exchange Server or Exchange Online.

  • G

    greylist (or graylist)

    A greylist (also spelled graylist) is a list of e-mail addresses or domain names that a spam filter uses to identify suspected spam. If a message arrives from an address or domain on the list, it will be quarantined and then delivered to the subscriber only if the sender attempts to send the message again within a certain period of time... (Continued)

  • H

    hash buster

    A hash buster is a program that generates a string of text for insertion in a spam message so that, to a spam filter, the e-mail appears to be a different message each time it is sent.

  • I

    image spam

    Image spam is junk email that replaces text with images as a means of fooling spam filters. Image delivery works by embedding code in an HTML message that links to an image file on the Web... (Continued)

  • K

    KnujOn

    KnujOn is an interactive Web-based spam reporting service. Through persistent policy enforcement, KnujOn reduces the value of unsolicited bulk email (UBE) by both eliminating transaction platforms and increasing the operational costs for spammers. (Continued...)

  • M

    Microsoft Exchange 2013 Poison Message Queue

    Microsoft Exchange 2013 Poison Message Queue is a queue that exists specifically to hold messages deemed harmful to the deployment after a transport server or service failure.

  • Microsoft Exchange Online Protection (EOP)

    Microsoft Exchange Online Protection (EOP) is an email cloud service that provides end users with protection against spam and malware.

  • S

    self-sending spam

    Self-sending spam is unsolicited e-mail that looks like you sent it to yourself: your name appears on the "from" line as well as the "to" line.

  • Sender ID

    Sender ID is Microsoft's proposed e-mail sender authentication protocol designed to protect against domain spoofing and phishing exploits.

  • spam confidence level (SCL)

    Spam confidence level (SCL) is a numerical value indicating the likelihood that an incoming email message is spam. SCL is a component of the Microsoft Exchange spam filter... (Continued)

  • spamblock

    A spamblock is a text segment interjected into an e-mail address to foil a spambot (a program that a spammer uses to troll the Internet seeking e-mail addresses).

  • spambot

    A spambot is a program designed to collect, or harvest, e-mail addresses from the Internet in order to build mailing lists for sending unsolicited e-mail, also known as spam.

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