Fix infinite logging loop when a service inspects the mail service #116
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This was referenced Oct 22, 2022
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From my quick approximation, it looks like from #115 some plugins injecting code to check dispatched emails can also send an email, triggering an infinite loop of logging that stops when the PHP function call limit is hit.
This hotfix checks if an email has already been dispatched before creating a new log entry, which should stop runaway logging before it happens. Needs further testing.