NethServer 6

**Issue
Postamaster receives this mailer-daemon

-------- Messaggio Inoltrato --------
Oggetto:
failure notice

Mittente:
MAILER-DAEMON@***

A:
anonymous@****

Hi. This is the qmail-send program at *****.
I'm afraid I wasn't able to deliver your message to the following addresses.
This is a permanent error; I've given up. Sorry it didn't work out.
Recipient unknown
--- Below this line is a copy of the message.
Return-Path: 
Received: (qmail 32069 invoked by alias); 31 Aug 2014 22:00:04 -0000
Delivered-To: alias-localdelivery-sogo@******
Received: (qmail 32066 invoked by uid 5028); 31 Aug 2014 22:00:04 -0000
Date: 31 Aug 2014 22:00:02 -0000
Message-ID: <20140831220002.32061.qmail@***>
From: root@*****(Cron Daemon)
To: sogo@****
Subject: Cron /usr/sbin/sogo-tool expire-autoreply sogo:hzsJZaS2VO**********
Content-Type: text/plain; charset=UTF-8
Auto-Submitted: auto-generated
X-Cron-Env: 
X-Cron-Env: 
X-Cron-Env: 
X-Cron-Env: 
X-Cron-Env: 
<0x0x83169b4[SOGoCache]> Cache cleanup interval set every 300.000000 seconds
<0x0x83169b4[SOGoCache]> Using host(s) 'localhost' as server(s)
<0x0x8323b54[LDAPSource]> WARNING: using old bindFields format - please update it
2014-09-01 00:00:04.268 sogo-tool[32058] failure. Attempting with a renewed password (no authname supported)
2014-09-01 00:00:04.308 sogo-tool[32058] Could not login 'paola' on Sieve server: <0x0x840656c[NGSieveClient]: socket= connectedTo=<0x0x8408884[NGInternetSocketAddress]: host=localhost port=4190>>>: (null)
2014-09-01 00:00:04.314 sogo-tool[32058] An error occured while removing auto-reply of user paola

Explanation
There is a cron job like this:

# cat /etc/e-smith/templates/etc/cron.d/sogo/10base
0 0 * * *      sogo    /usr/sbin/sogo-tool expire-autoreply sogo:D23LsFi07KTCpxXUc**********

• sogo-tool expire-autoreply exit with ouput
• this ouput generates an email
• sogo user hasn't mail folder
• this email is bounced to postmaster

Solution proposed

Modify the cronjob suppressing output

0 0 * * *      sogo    /usr/sbin/sogo-tool expire-autoreply sogo:D23LsFi07KTCpxXUc*****  >/dev/null 2>&1