[Dovecot] LDA vs. LMTP

[Ben Morrow]

At  4PM -0500 on 29/07/13 you (Stan Hoeppner) wrote:
> On 7/29/2013 2:30 AM, Jan Behrend wrote:
> 
> > You cannot use the LDA method if SMTP and IMAP services reside on
> > different machines, which would be the case in larger scale mail system
> > setups.
> 
> Which brings up an interesting point.  With a single LMTP daemon on the
> Dovecot server communicating via a single socket with the upstream MTA
> over the wire, it would stand to reason that message throughput rate may
> be limited by serialization in the LMTP request/reply chain.  There is
> no parallelism, and thus there is relatively high latency.

What makes you think an SMTP server delivering over LMTP only makes a
single connection to the LMTP server? I believe Postfix by default makes
a fresh connection for each delivery.

Ben