postmaster@ exists for many, many more reasons than non-deliverability. Again, multiple RFCs dictate its existence and management. Advice to the contrary demand

postmaster@ exists for many, many more reasons than non-deliverability. Again, multiple RFCs dictate its existence and management. Advice to the contrary demands a better rationale than you're providing, and is ill-advised. If you operate SMTP and I can't get through to you on postmaster@ ("yo, back off your retries," for example), I'm probably going to blacklist you. I'm not unique in the slightest. The decentralized nature of SMTP demands that I have a hotline to you, the MX operator, without having to navigate a Web site to maybe find you.