David W. Tamkin remarked:
,,, ...Subscribers may post from other addresses without telling you. It may be a better idea to shunt mail from unrecognized addresses to a holding folder that you review with your own eyes.
That seems to be a reasonable approach.
My intention was to reduce the extra traffic of bounce messages to illegal addresses and their subsequent non-delivery notices, not so much to avoid having to see the offending messages myself as list maintainer.
I'll watch the results for a while. Perhaps I'll get another bright idea.
smartlist@lists.rwth-aachen.de