agent
Click on the red underlined text to get to the source
... MTS is provided by MTAs which interact using the MTA (Message
Transfer Agent) Service, which defines the interaction between MTAs,
...
... interworking
are recommended to require that their X.400 User Agents are able to
display these heading extensions. Support for the various service
...
...
This considers reception by an RFC 822std11(-> 2822prop) User Agent of a message
originated in an X.400 system and transferred across a gateway ...
... N/A (local)
These elements are only applicable to User Agent / Message
Transfer Agent interaction and so they cannot apply to RFC 822std11(-> 2822prop)
...
... These elements are only applicable to User Agent / Message
Transfer Agent interaction and so they cannot apply to RFC 822std11(-> 2822prop)
recipients.
...
...
2. X.400 User Agent implementations will not in general
recognise these extensions. Therefore, although the
information will be present, it will often not be available
...