Hi, We have been tracking the numbers on SNDS for a few years. One of the metrics we monitor is the difference between “RCPT commands” and “Message recipients”. See also the section “Message Recipients” on the SNDS FAQ page:
"This is the number of recipients on messages actually transmitted by the IP. With well-behaved mailers, there is often a small difference (a few percent) between the number of RCPT commands and this number, due to accounts becoming inactive and other such anomalies." Previously we rarely detected a large difference between these numbers, and the difference was accounted for with 5XX errors. But since a few weeks we noticed that on multiple IPs from different senders the number of “Message recipients” has suddenly dropped to unexplainable low values. This would suggest a high rejection rate, but the number of bounces does not match up with the difference. And I don’t assume that Microsoft is now dropping messages on the floor in larger quantities. It looks like something has changed in SNDS. Did anyone else notice a recent change in the “Message recipients” column? Or better yet, can someone explain how we should interpret this number now? Thanks, Maarten Oelering Postmastery
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