technically yes, there're two ways to do that :
A) you could do that by using a custom mail hanlder. Currently, the default mail handler allows to create and/or comment an issue. A custom mail hanlder should use the issue key in the subject, check if it is a closed issue and reopen it, and comment issue at the same time.
B) You could implement a custom listener that, on event issue commented, will reopen the issue if it is a closed status.
Hope this helps,
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