RE: Activation points and callout modes

Hi Hilarie,

> 
> I don't see how D (email body modification) "falls back" to A (command
> modification), but as long as it can be done, I don't care what letter
> gets assigned to it.

On Jan 20 you replied to an earlier message saying:
  > Yes, I think that operating on the DATA portion fits into the
  > architecture without the need for special consideration.

That is what I wanted to describe here again. The email message body is
the data coming after the DATA command. It can be seen also as command
modification. No special consideration necessary -> D "falls back" to A.


> 
> I'd not thought that the OPES processor would be maintaining queues, [...]

And I assumed that most MTAs maintain something like queues in order to
store the messages they receive before they forward them (or maybe to store
if they cannot forward immediatly).
But I may be wrong.

Has anybody a clear view on how many MTAs (percent of real world deployment)
can only work in a non-storing proxy mode (only accepting a message if they
already successfully forwarded to the next MTA in a parallel SMTP dialog)?
And how many MTAs do always store a message before forwarding?
And how many try a direct forward and store only if that does not work out?

Regards
Martin