Re: MTA or SMTP proxy?

On Fri, Jul 03, 2009 at 11:50:26PM +0200, mouss wrote:

> 
> In theory at least, a final delivery MTA could deliver directly, without
> a queue. of course, there is the problem of privileges. but for example,
> on a system where the whole mailstore belongs to a single (virtual)
> uid:gid, then the final MTA can deliver directly to a maildir. some
> people even think this should be the way to deliver mail ("immediate
> delivery").

This cannot be atomically for multi-recipient mail. SMTP requires
a single response for all recipients after ".", this requires either:

	- a Queue

    OR

	- an atomic multi-recipient final delivery mechanism.

So indeed SMTP (in the general case) does impose some constraints on
MTA queueing behaviour.

--

-- 
	Viktor.

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