diff --git a/etc/group b/etc/group
index 4771b9acb..f282b188a 100755
--- a/etc/group
+++ b/etc/group
@@ -13,4 +13,6 @@ server:*:11:
 games:*:13:
 sshd:*:23:
 smtpd:*:26:
+postfix:*:27:
+maildrop:*:28:
 nogroup:*:99:
diff --git a/etc/passwd b/etc/passwd
index a319b77f2..bd0d87f1b 100755
--- a/etc/passwd
+++ b/etc/passwd
@@ -11,5 +11,7 @@ server:*:11:11:OS Servers:/:
 service:*:12:12:System Services:/:
 sshd:*:22:22:sshd:/:
 smtpd:*:25:25:smtpd:/:
+postfix:*:27:27:postfix:/usr/var/spool/postfix:/bin/false
+postgres:*:30:30:postgresql:/:/bin/false
 games:*:9998:98::/:
 nobody:*:9999:99::/tmp: