What is the best option for changing the recipient address case such as forcing 
all to be lowercase?

> All you need is a case folding regexp before your real virtual table.
> 
> /etc/postfix/main.cf:
> virtual_maps =
> regexp:/etc/postfix/virtual_regexp
> mysql:/etc/postfix/mysql-virtual.cf
> 
> /etc/postfix/virtual_regexp:
> /^(.*[A-Z].*)$/ $1
> 
> It's a little disgusting, but I expect that it would work.
> Wietse

I found this from 2003, is it still the best/only way?
Im using virtual_mailbox_maps instead of virtual_maps.

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