Sender Callout Exchange

• One drawback is that some wanted mail may end up in the junk folder, if the sender doesn't respond to the spamarrest challenge mail.
• Sender verification callout: A spam-prevention system in which the identity of the sender of incoming email is verified before the email is accepted.
• The standard method is for the receiving system to connect to the mail server specified in the "from:" header and verify the sender's identity.
• SMTP (simple mail transfer protocol) is the protocol defined in RFC 2821 that a mail host uses to transmit messages to another mail host along the path from sender to recipient.
• Set your email program like microsoft outlook express to not display the preview panel (see outlook express menu item 'view' then 'layout') because just opening a spam email might be enough to send information back to the sender that your email address is valid.
• Spam continues to grow as senders find motivation to increase their efforts.
• Challenge response filters: An "active" sort of spam filter that works by blocking unknown senders' mail from delivery until they prove that they are well-intentioned human beings and not spammers or robots.
• Challenge Response - a method of blocking spam which requires the sender of the email to manually respond to a verification message sent to them.
• Headers identify the sender and recipient of a message, the route the message took from one site to another and so on.
• The use of buffers or third-party senders, helps to isolate the actual spammer from recrimination.

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