What mail does a postmaster@ receive?

Quoting Chris Siebenmann in «The quiet death of postmaster@anywhere«:

I think it’s been years since our postmaster alias got anything but spam or bounces.

Well, here is a breakdown of what I receive in postmaster@

• ~60% are bounces, backscatter (which I delete)
• ~30% are spam (which I report to SpamCop)
• ~7% are abuse reports (which I forward to abuse@)
• ~3% are problem reports (which I resolve or forward to support@)