We are sending out emails from SFMC with delivery rate ~100%. Does it mean that all emails are being delivered to customer's inbox. Is there a way to find if some of those emails may have spammed.
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There's typically no way to tell if an email was delivered to a spam folder, as emails are typically sorted to a spam folder/deleted/blocked/etc after delivery, not during the SMTP process. The delivery rate simply shows that emails were received by an email inbox. For example, non-existent email inboxes or invalid mail domains would lower your delivery rate.
The metric you are looking for is inbox placement rate. This indicates what number of emails have indeed reached the inbox. This is difficult to measure without a dedicated ISP integration - offered by a.o. Return Path.
Inbox placement rates are most often ISP specific, and looking at domain open rates can give an indication of deliverability issues - especially when experiencing sudden and significant drops.
Let’s say your open rates are averaging 30%. Your Microsoft domains (msn.com, Hotmail.com) are seeing on average 25%, but suddenly drop to 10-12% for consecutive sends. It is a sign of further investigation being required - which can be done using ISP specific tools, or by reaching out to postmaster of that specific domain.
You can also log a support ticket with Salesforce, and ask them for help with resolving some of your deliverability related problems.