"jmaimon@ttec.com" <jmaimon@ttec.com> writes:

> Andrzej Adam Filip wrote:
>> "jmaimon@ttec.com" <jmaimon@ttec.com> writes:
>
>> Sendmail by default uses DeliveryMode=backgroud and delivers most
>> messages at once *WITHOUT* "processing the queue".
>
> Yes thats true, but thats not how to take best advantage of connection
> caching.

AFAIR (from exim "design philosophy") under normal conditions 80%-90% of
submitted email messages are assumed to delivered "at once".

It is possible to make *today's* sendmail much better "resuse" of
outgoing SMTP connections by changing delivery mode to queue and using
queue groups selected by recipient address *BUT* as I understand it will
hit I/O load (especially on journaling filesystems).

Signifficant improvements of outgoing session reuse without significant
redesign of andmail and without need to queue are possible but they
would require using of "not fully portable features" in sendmail sources.

--
[pl2en: Andrew] Andrzej Adam Filip : anfi@priv.onet.pl : anfi@xl.wp.pl