Q:

When both sender and receiver are connected to a mail server via a LAN or a WAN, we need ___________________.

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When both sender and receiver are connected to a mail server via a LAN or a WAN, we need ___________________.


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

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 (a).two UAs, two pairs of MTAs, and a pair of MAAs

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