You can change the setting to include or not to include a copy of a PM sent to your email. It defaults that way, but it can be changed. Because there are several people who join just to sell stuff and never check in, or don't know how to check in is the biggest reason. Also, some people would prefer a text or even a email to their personal email. There are several times when someone has something for sale that people send them PM's with no response. With the seller posting their preferred method of contact, there should be no excuse for not getting responses. All the rules in the "Trading post" just eliminate confusion and problems. Hope this answer helps.
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