According to the IMAIL manual, you are supposed to divide the total number of recipients by 25 and enter that in as the "messages per process."
Our list is 150,000 addresses so won't 6000 messages per process basically put the server on it's knees?
No. It means that you'll have 25 processes, each serially sending out 6,000 E-mails. So if the first 100 E-mails are to mailservers that are on slow connections and each take 60 seconds to process, it will be 2 hours before IMail starts working on the other 5,900 E-mails.
We're going to upgrade the SMTP server but would like to continue using Windows & Imail for this job.
There must be a more concrete way to establish the requirements (hardware/software specifications) for sending to a list of this size?
I'm assuming there are folks out there who use IMAIL successfully to send to 150,000+ lists?
It's not easy to do. One option is to use our Declude Queue (which is built into all the Declude programs, including the free Declude Confirm). If you send in batches of less than 6,000 recipients per message (as most people end up doing), Declude Queue would help speed up the delivery (as it makes sure that IMail is sending at its maximum capacity). But, it still isn't going to get the E-mail out fast, as you are still limited to about 30 parallel processes.
We have been doing some work with an experimental program that is designed exactly for a situation like this, a "lazy mailer" that will intercept the E-mail to the list, and try each address once. If the delivery can be accomplished easily without re-queueing, it will be done (if not, it will get sent to IMail for later delivery). This wouldn't have any process (or even thread) limitations, so it could easily have 1,000 or more E-mails being processed in parallel.
-Scott
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