MTAs are always needed at the centre of a STANAG 4406 system for transferring
messages, and will be associated with sites supporting users provide for message
submission and delivery. An MTA will typically support a medium or large number
of users via User Agents (UAs) that provide the STANAG 4406 client interface to
the end user.
Typically, a user will run a UA on his or her PC, which will connect over
a network to an associated MTA. In high bandwidth environments, MTAs usually
run on separate servers and support many UAs.
This paper discusses solutions for low bandwidth environments where MTAs are
used to support single UAs. This 'single user MTA' setup seems odd, but is
required because of the nature of MTA-to-MTA protocols, and features they have
that are not supported in UA protocols.
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