I'm tasked with managing and improving email marketing for my new employer. They regularly send to a genuine double-opt-in list of over 100K recipients. They are currently using IIS SMTP for this - and it works really well - but there is no DKIM capability without paying for a commercial plugin or external service.
I recently set up hMail server on an alternative port and switched the marketing software over to it for a test delivery with DKIM signing. Technically all went well, but the delivery took several hours compared to several minutes using IIS. I tried various configurations of thread/session counts during the delivery, restarting the server and resuming the queue each time to ensure the settings were applied, but this only marginally improved the speed. We send the campaigns at specific times for the best open rates, so waiting this long for a delivery to complete is not an option.
I'd like to be able to repeatedly test the delivery speed of hMail (and other servers) without damaging/wasting a valuable campaign. Is there any way I can have hMail genuinely send thousands of emails in its own time, but somehow catch them so they are not delivered to the actual recipients - some kind of 'black-hole' method or application?
Thanks in advance
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