[tankenmate]

This is why I use Postfix and Cyrus for my personal mail. I get Postfix to pre-parse transform the '-' char to '+'; this way I can use email addresses that stupid systems don't barf at but can still get mail delivered to the right mailbox (including sub mailbox if it exists). e.g. [e-mail] goes directly to my junk mail box :)

[tankenmate]

I should have mentioned in the previous post, recipient_canonical_maps is probably what you are looking for. Depending, trivial_rewrite might also fit your use case depending on how early into the delivery process you want the addresses to be rewritten.