I am using a Greylisting system, partially taken from other solutions on the
web and partially constructed myself.
As the system is running, I see more and more different mailing systems
using different VERP addresses. Those are not really a problem for the
Greylisting system, but need some fine-tuning.
I define rules for those sender addresses to rewrite them to a common form.
Thinking others do the same, I want to share my rules and ask for yours: