Sender Callout Exchange 2010

• If a sender's ip appears in a blocklist, the mail host can reject delivery of the message so that it will not show up in the recipient's inbox.
• Challenge Response: A spam-prevention system in which the first email contact from an unknown sender is bounced back with a "prove this is really you" message.
• Once the sender jumps through whatever hoop the challenge-response system requires, they are allowed to send mail to the recipient.
• Better c-r systems will queue the original message, and send it through once the sender has validated themself, saving the sender the trouble of retransmitting the message.
• Graylisting has spawned a couple of related techniques that also exploit the fact that spam mail senders don't follow the rules of smtp.
• You may just be unlucky and receive a spam email as a result of the sender automatically generating common or typical email addresses.
• Then a "challenge" message is automatically sent back to the sender, asking for a response, and if such a response is received, the sender's original message is delived.
• The sender policy framework (SPF) is a set of procedures that allows mail providers to exchange information in real time on who they permit to send mail and from which hosts.
• orgSender Policy Framework is an attempt to solve the problem of sender address forgery.
• Most spam and other abusive email contains a forged sender address.
• The features that come with microsoft outlook 2003 to counter spam are as follows · junk e-mail filter · safe sender's list · safe recipients list · blocked sender's list · autoupdate and the difference between microsoft outlook 2000 and microsoft outlook 2003 is that in outlook 2000 the email user has to create his own spam filter customized to what he needs.

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