users_and_groups() {
	 getent group amavis >/dev/null || groupadd -g 333 amavis >/dev/null
	 getent passwd amavis >/dev/null || useradd -u 333 -M -d /var/spool/amavis -g amavis -s /bin/false amavis >/dev/null
}
filters_howto() {
	 cat <<EOF
 To use virus or spam filters, comment these lines in /etc/amavisd/amavisd.conf:
     @bypass_virus_checks_maps = (1);
     @bypass_spam_checks_maps = (1);
EOF
}
post_install() {
	 users_and_groups
	 filters_howto
}

post_upgrade() {
    users_and_groups
	 [ "$(vercmp $2 2.8.0-1)" -lt 0 ] && cat <<EOF
 Things have moved again. Amavis now uses these directories:
    /var/spool/amavis <-- homedir, database, quarantine, etc
    /run/amavis       <-- pid, lock, socket
 You must update /etc/amavisd/amavisd.conf to prevent breakage!
EOF
	 [ "$(vercmp $2 2.6.4-4)" -lt 0 ] && filters_howto || :
}

post_remove() {
	 groupdel amavis &>/dev/null
	 userdel amavis &>/dev/null
	 [ -d /var/spool/amavis ] && echo "You still need to clean up /var/spool/amavis" || :
}