I tried to change this in the notification schemes but it didn't seem to work. Which notification scheme specifically applies to notifications for when a ticket is "In progress"
Notifications are not based on status, they are send out whenever an event has been triggered.
The events that are used can be found in your notification scheme.
These events are either triggered by JIRA automatically (for example:the comment added event) or by the workflow transitions in their post-functions.
It is not possible to say: only send out events for issues that are not in state 'In Progress'
You could ofcourse edit your notification scheme and remove everybody from receiving notifications when an issue has been updated, or commented, and so on.
Some more information can be found here: https://confluence.atlassian.com/display/JIRA/Configuring+Email+Notifications
Do keep in mind that not everything that's mentioned here is possible on OnDemand.
I think the best solution for you would be to limit the number of emails send out by JIRA by making the notification scheme simpler.
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