I don't know. I do know that I get emails any time someone sends me a private message. Exactly why, I'm not sure - it must be something with how I've enabled email support through my profile.
What I don't like is that the person's contact info isn't in the email - so the only way I can reply is to physically visit the forum site and reply though the forum software. Which is fine I guess, but isn't as easy as just hitting reply in email...
I have also received email notification of private messages. I don't remember setting up anything special to get this functionality, so it must be the default way it works.
I agree, it is a pain to have to visit your "private message" inbox on the forum in order to answer the query.
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