*.spec.in: require amavisd-new >= 2.8.0-4. Refs #2093
db defaults: remove Runlevels prop. Refs #2067
/etc/amavisd.conf template: adjusted pid file and home dir paths. Refs #2093
/etc/postfix/main.cf template: Permanent error for non-existing recipients (SMTP code 550). Refs #2108