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SMTP queuing / chunking

Posted on 2014-04-23
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Last Modified: 2014-04-24
Client uses Windows Server SMTP to send automated messages to company managers about network status etc. Goes through ISP's SMTP (Optimum Online/Cablevision).

Last week a major glitch caused the SMTP server to send 5,000-7,000 emails all at once, triggering the ISP to stop outgoing service (limit is 500 emails out per hour). Took 24 hours to get outgoing service restored.

Any way to configure Windows Server SMTP to queue (batch, chunk, whatever you call it) to a certain number of messages per hour to avoid this issue in the future? The idea to limit outgoing email to, say, 400 emails per hour and send the next batch of 400 as soon as the hour passes. Or something like that.

Such an incident is not supposed to occur but if it does then it's a major inconvenience.
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Question by:milhouse537
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Qlemo earned 500 total points
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AFAI can see there is no option to throttle sending out mails but by limiting the number of connections to the same domain (default is 100), but I don't know whether that would help at all or with a smart host.

Even if you could do that, the queue would need a lot of time to empty - not letting thru new notifs in due time. If you ask me, bad idea.

A better way, and certainly possible, is to set a performance counter alert for the mail queue length, and if exceeding the limit of say 400 stop the service plus send out an email alert, so the issue can be fixed in time.
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