Exchange 2007 Has New Inbound Email Control

Exchange 2007 offers a useful new option to help control inbound email problems.

Denial-of-service (DoS) attacks and mail system overload are two major problems affecting inbound email. Three main ways to deal with these are:

  • Throttling — The inbound gateway only allows an acceptable number of connections and/or messages at a time.
  • Blacklisting — The inbound gateway refuses connections from servers that violate certain predefined rules.
  • Backpressure — An overloaded receiving MTA tells sending MTAs to resubmit messages at a later time.

These technologies have been provided for some time in many spam control products. Exchange 2007’s new Edge Server role will also offer them, integrated with its spam filtering.

Josh Maher

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