ENVID generation and DSN support

Hi,

I ve just read the implementation of the SMTPTransport class and I need som=
e
explanation about the ENVID generation.
The ENVId is part of the SMTP protocol and provides an "envelope" for the
current SMTP transaction. The transaction is identified by the ENVID, uniqu=
e
ID. When the message tracking (MTRK property in the Session) is true, an
ENVID is added to the MAIL sommand.=20

So here are my questions:

Why is the ENVID value different from the Message-ID?
How can we get the ENVID value once it has been generated? Because it is a
good way to track the DSN messages sent from the MTAs to the sender's MUA,
so it would be nice to retreive it after the mail was sent.

Thank you,

R=C3=A9mi
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