I contacted instructure as I was concerned about this and Instructure support confirmed back after testing
"Concerning your inquiry about whether suspended accounts can still receive notifications, I couldn't locate any information indicating a resolution to this matter. Nevertheless, I replicated that scenario by using a test student. In my observations, the student did not receive any notifications. I even conducted a test by sending a message through the Inbox, but no notifications were generated. I trust this provides the information you were seeking."
Not say there maybe instances due to individual setups that may affect this (self hosted).
Would be interested to hear anything different to this.
Thanks
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