It's just been so long since I've done IT/SRE work besides just development that I wasn't sure if maybe MIcrosoft had their own spam filter that they do on top of whatever your local Exchange server has set up. I guess thinking about it now, that would probably annoy a bunch of IT workers who are wondering where/why emails are getting marked as spam (even more so if they're not actually spam) before even reaching their Exchange server.
Here's a 10 year old article from Harvard Business that put it at around 95 cents/email :
https://hbr.org/2013/04/email-is-not-freeThis accounted for the time wasted with people reading the spam emails too though:
"Anecdotally this clearly affected our companyâs efficiency, but we had all the data points to calculate the bottom-line financial impact. By
calculating average typing speed, reading speed, response rate, volume of email, average salary, and total employees, *we were looking at a
seven-figure price tag to quantify our email pollution*. A âfree and frictionlessâ method of communication had soft costs equivalent to procuring a small company Learjet. Each individual email ate up 95 cents of labor costs."
AWS charges 10cents/email sent or received but that's to the person buying their service so the actual cost for Amazon is much much less:
https://aws.amazon.com/ses/pricing/Not sure how much you can actually trust Quora but this seems more on track of what we were thinking:
https://www.quora.com/How-much-does-it-cost-to-send-an-email"400 words is about 2.4 KB. Email headers add on about 2.6 KB. So that's about 5 KB of text. Amazon SES will let you send 350 TB of email per month at $0.05/GB. 350 TB is 358400 GB. At $0.05 GB, that's a total of $17,920. 350 TB is 375809638400 KB. 375809638400 KB / 5 KB/email = 75161927680 emails. $17,920/75161927680 emails is about $0.00000023841 per e-mail, or 0.000023841 cents per e-mail. So ... about two hundred thousandths of a cent."