Just FYI guys - - you will receive many types of notifications, including emails from the site. The reply-to address is email@example.com. This comes directly to DOW headquarters, and will be answered by yours truly.
I know it's a bit confusing when the "sender" appears to be a person you're talking with, even by a PM. But the sender is really the website, and replies will go back to the reply-to email (if you look, it's always firstname.lastname@example.org)
If you reply to a PM or a notification via email, the other person won't get the message. I will. Then you'll get an email from me, reminding you to reply through the site.