This is strange, as we get many emails every day on both tcssup@adobe.com as well as techcomm@adobe.com and reply to all of them.
BTW, I noticed that your error messages has a fullstop at the end: techcomm@adobe.com. maybe this could be a problem? But it might also be just an added fullstop from the server.
However, I cannot completely exclude that Adobe's mail system might sometimes filter out emails that come from "looks like spam" email accounts like abc123xyz@gmail.com. So, that might be a reason why some emails might not come through to us.
Please feel invited to send me an email directly (my last name at adobe.com), and I will check with the teams.