Q:

When the sender is connected to the mail server via a LAN or a WAN, we need ______________.

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When the sender is connected to the mail server via a LAN or a WAN, we need ______________.


  1. two MTA
  2. two UAs and two pairs of MTAs
  3. two UAs and a pair of MTAs
  4. none of the above

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 (b).two UAs and two pairs of MTAs

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