When you click "Reply" you get a message form with the top portion filled out. Underneath the "From" line is the "Newsgroup" line, which shows what newsgroup(s) will receive your message. It's just a matter of paying a little more attention to the automated portion of the email client. No need for "Tech Support." Don't worry about having cross-posted. I've done it by accident many times, just because I didn't notice the other newsgroups listed. I'm generally focused on what I'm going to type. To err is human.