I noticed that just about all ticket information (summary, description, fields, etc.) can still be edited after closing and setting a resolution. Is it possible to prevent re-editing of a ticket after it is closed?
Yes this is possible.
You would need to set a property on a status.
This property key: jira.issue.editable
And with property value: false
You can find more properties to set within the following documentation article
Thank you, thats really helpful. In that case, what would happen with customer's replies to our ticket notifications that would normally be added as comments?
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Nothing as the issue can't be edited anymore.
The best way is to send out an email via automation when the issue transitions to the closed status, making the customer a where that there issue is closed and they need to raise an new issue if more help was required.
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