Define a per-user whitelist of allowed envelope senders with Postfix's sendmail

Hi, Is there any solution that would define or whitelist as which sender can each of local system accounts send e-mail when using Postfix's sendmail binary? I have a hosting server with PHP-FPM FastCGI server, each site on the server runs as one PHP-FPM process, each site has its own local user o

Virtual aliases and "Delivered-To:" header

Hi guys, I have a problem setting up my postfix so it records all (virtual) aliases' expansions into e-mail headers. I have a postfix 2.6.5, amavis 2.6.3 and (virtual) delivery to dovecot 1.2.6 (on Gentoo which is probably not important). The thing is that I want e-mail headers to contain all al