Protocol TBR is not a standalone protocol; rather
it is an extension to the SMTP protocol. TBR stands for “Transferred By
Reference.” When this extension is used, the Simple Mail Transfer
Protocol (SMTP) then uses HTTP and XAM (Extensible Access Method)
infrastructures to transfer the message. Protocol TBR, or the TBR
extension of SMTP specifies three mandatory arguments and one optional
argument. The mandatory ones are: forwarding count, an eXAM URI, and an
end-mark tag. The optional argument involves trace headers. According to
the September 2007 draft by Douglas Otis of Trend Micro and John Leslie
of JLC.net proposing protocol TBR to the IETF, the TBR extension of SMTP
helps reduce the spread of unwanted email messages as well as reduces
the harvesting of email addresses by spammers. By eliminating
acknowledgments such as “unknown recipient” that are sent back to
senders, email harvesters have one less tool for validating an email
address. Protocol TBR establishes a means of checking senders and
recipients. For example, if a sender has been deemed abusive or a
spammer or if the recipient is invalid, the message may not be fetched
and delivered, thus reducing the amount of undesirable email messages.
It also reduces the heavy network loads imposed upon servers due to
SPAM.
Associated Protocol TBR Applications:
Email applications such as Microsoft Outlook and Exchange
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