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>       5.5. Establishment of mediated connections
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<                     MAIL-REQUEST) SP Version CRLF Body))
---
>                     MAIL-REQUEST |
>                     SYN-REQUEST) SP Version CRLF Body))
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> 5.5. Establishment of mediated connections
>    The objective of the SYN command is to establish a connection
>    between sender and receiver. The connection is mediated by the server.
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>        SYN-COMMAND = "SYN" SP mailbox SP timeout
>        timeout = 1*HEX
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>    The SYN command MUST be followed by an e-Stub reference in whose e-Stub
>    the given mailbox appears as the <from> or <to> field.
>    The server SHOULD reply to the client SYN approximately after the timeout
>    value in milliseconds or earlier, as measured since the time the server
>    received the SYN command. 
>    In general, it is difficult to achieve fine grained time-outs, but the 
>    server SHOULD take any reasonable step to reply within the time-out.
>    If the server has an e-Stub that has been "accepted", for which both the 
>    <from> (sender) and <to> (receiver) are waiting for a reply to a SYN, 
>    the server SHOULD reply to both sender and receiver with a 200 status code.
>    If the server generates a 200 reply, the sender must send <filesize> 
>    OCTETs to the server, which MUST relay them to the receiver.
>    Upon completion of the transfer, the server MUST discard the e-Stub.
>    If the addresses and e-tag do not match up, the server MUST respond with a 
>    402 reply.
>    If the addresses and e-tag do match up, but the e-Stub is not "accepted",
>    the server must respond with a 405 reply.
> 
>