--- /dev/null
+#!/bin/sh
+
+set -e
+
+PATH=/sbin:/usr/sbin:/bin:/usr/bin:$PATH
+
+[ -x /usr/sbin/postalias ] || exit 0
+[ -f /etc/postfix/main.cf ] || exit 0
+gecos="/var/lib/postfix-cn/aliases_gecos"
+grep -q "hash:$gecos" /etc/postfix/main.cf || exit 0
+
+[ -d /var/lib/postfix-cn/ ] || exit 0
+
+# Load CARNET Tools
+. /usr/share/carnet-tools/functions.sh
+
+getent passwd | awk -F: '
+ $3 >= 100 && $1 != "nobody" && $5 \
+ {
+ split($5, g, ",");
+ if (g[1]=="") {next};
+ gsub(/ /, ".", g[1]);
+ print tolower(g[1]) ": " $1;
+ }' > $gecos.dpkg-tmp.$$
+
+
+if ! cmp -s $gecos.dpkg-tmp.$$ $gecos > /dev/null; then
+ cp_mv $gecos.dpkg-tmp.$$ $gecos
+ postalias hash:$gecos
+else
+ rm -f $gecos.dpkg-tmp.$$
+fi