I't's been there a while. But I think it's kinda strange you can PM with yourself.
It is espacially strange with the welcome PM's. People get a PM with "welcome", they reply with thanks, and that reply is lost in space. No warning whatsoever.
SELECT * FROM `ubbt_PRIVATE_MESSAGE_TOPICS` WHERE `TOPIC_SUBJECT` ='Welcome' and `TOPIC_REPLIES`>0
Executing that query showed me actual users who replied on their welcome PM, only to have their reply lost in space.
A scenario where a user PM's someone, deletes it to keep his box clean, and any reply would also go lost in space.
My suggestion would be in case of a reply to a specific user in a private topic, to make sure the intended recepiant gets is.
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