double bounce policy

[Jos Okhuijsen]

Hi there,

What is your policy for double bounces? 
Users come and go, and always seem to leave subscriptions open, and produce bounces. 
Most of these bounces doublebounce. 
Do you write to the postmaster of these domains? (Seems to have no effect. )
Or just blacklist?  (and possible handicap other users?)
Or just accept the fact that return-addresses usually don't work?

Jos