Not really.
When a PM is sent the following happens:
- A new row is inserted into the pmtext table with the text of the PM.
- A new row is inserted into the pm table for each receipant of the PM, and 1 for the sender of the PM
Removing the row from the PM table, will make the PM unreachable for this receipant/sender.
Stale pmtext rows (ie a pmtext with no row in the pm table anymore) are cleaned up on a regular basis by a scheduled task.
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