On Tue, 16 Sep 2014 22:43:14 +0000, Brett Watts <[log in to unmask]>
wrote:

>The message is submitted to Listserv then when the message leave listserv, it takes 20-30 minutes to be picked up by our SMTP server which is an cloud version of Ironport.
>
>I have also seen in the SPOOL folder that a message to a list of 1000+ may take up to 2 hours to be delivered.  Messages take 10 - 20 seconds to be processed in through the Spooler.

None of this is a fault of LISTSERV.  It is all about your SMTP
infrastructure.  If my SMTP mailer took 20+ minutes to accept outgoing mail
from LISTSERV I would be looking for another SMTP server with faster/better
service.  If it takes 2 hours to clear the ~\SPOOL dir for a mailing to
1000+ you clearly have an extremely weak outbound mailer, completely
unsuited for any kind of 'emergency' messages.

LISTSERV does support outgoing SMTP Worker Pools (Advanced Topics Guide,
Sect 12) so if you have 2 mail servers, most lists can use the 'slow' server
for ordinary traffic, while the 'emergecy' list can use a separate, high
speed mailer.  

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