Which SMTP element?

Folks,

what we need to solve now is the issue with respect to "what SMTP 
element to focus on first", and whether distinguishing between SMTP 
elements makes sense - see below from earlier emails.

>> And then add something like "Several kinds of agents participate in
>> SMTP exchanges, including MSA, MTA, MDA, and MUA. The first SMTP
>> adaptation profile will address the needs of at least the XXX SMTP
>> agent. More profiles may be needed to address other agent-specific
>> needs." I do not know what agent should replace XXX placeholder above.
> 
> 
> Do we believe that the role of a SMTP element will have any impact on 
> the OCP profile(s)?
> 
> I guess until we know for sure the proposal aboce makes sense. I'll put 
> the proposed text in the draft charter for now.
> 
> Martin - since you've been implementing iCAP-based SMTP forwarding 
> already, what SMTP element would you suggest, what's needed first? What 
> makes sense?

So, following questions:

(a) Does it make sense to distinguish between different SMTP roles?
(b) If the answer to (a) us 'yes', what role should we focus on first,
     i.e. where's the most practical need?

Thanks,
   Markus