Mail rejected

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Hello,

I am not really sure if chose the right section of this forum.

I have a cloud server (single core, 1 Gb RAM, 30 Gb disk space) with Ubuntu 12.04 as OS. I’ve installed the zPanel and roundcube. The problem is some of our emails get rejected and it happens mostly to one user:

Can you please help me find the root cause of this issue ?

1. Begin forwarded message:

From: MAILER-DAEMON@server1.example.com (Mail Delivery System)
Subject: Delayed Mail (still being retried)
Date: October 3, 2013 7:55:49 PM GMT+03:00
To: oana.suciu@canah.com

This is the mail system at host server1.example.com.

####################################################################
# THIS IS A WARNING ONLY. YOU DO NOT NEED TO RESEND YOUR MESSAGE. #
####################################################################

Your message could not be delivered for more than 4 hour(s).
It will be retried until it is 5 day(s) old.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

The mail system

<daniel.popa@happytour.ro>: host 127.0.0.1[127.0.0.1] said: 451 4.5.0 Error in
processing, id=04574-09, virus_scan FAILED: AV: ALL VIRUS SCANNERS FAILED
(in reply to end of DATA command)

<ciprianfhm@yahoo.com>: host 127.0.0.1[127.0.0.1] said: 451 4.5.0 Error in
processing, id=04574-09, virus_scan FAILED: AV: ALL VIRUS SCANNERS FAILED
(in reply to end of DATA command)
Reporting-MTA: dns; server1.example.com
X-Postfix-Queue-ID: 4BEE8C1CD6
X-Postfix-Sender: rfc822; oana.suciu@canah.com
Arrival-Date: Thu, 3 Oct 2013 12:07:01 +0000 (UTC)

Final-Recipient: rfc822; daniel.popa@happytour.ro
Original-Recipient: rfc822;daniel.popa@happytour.ro
Action: delayed
Status: 4.5.0
Remote-MTA: dns; 127.0.0.1
Diagnostic-Code: smtp; 451 4.5.0 Error in processing, id=04574-09, virus_scan
FAILED: AV: ALL VIRUS SCANNERS FAILED
Will-Retry-Until: Tue, 8 Oct 2013 12:07:01 +0000 (UTC)

Final-Recipient: rfc822; ciprianfhm@yahoo.com
Original-Recipient: rfc822;ciprianfhm@yahoo.com
Action: delayed
Status: 4.5.0
Remote-MTA: dns; 127.0.0.1
Diagnostic-Code: smtp; 451 4.5.0 Error in processing, id=04574-09, virus_scan
FAILED: AV: ALL VIRUS SCANNERS FAILED
Will-Retry-Until: Tue, 8 Oct 2013 12:07:01 +0000 (UTC)
Return-Path: <oana.suciu@canah.com>
Received: from [192.168.1.7] (unknown [109.97.32.80])
by server1.example.com (Postfix) with ESMTPA id 4BEE8C1CD6;
Thu, 3 Oct 2013 12:07:01 +0000 (UTC)
Subject: Re: Documente servicii turistice
Mime-Version: 1.0 (Apple Message framework v1283)
Content-Type: multipart/alternative; boundary=”Apple-Mail=_FCCF84ED-E778-41F9-B97A-DD9215510DC4″
From: Oana Suciu <oana.suciu@canah.com>
X-Priority: 3
In-Reply-To: <f8e1b50337ceae3a1fa6ae5be0783a61@tina.happytour.ro>
Date: Thu, 3 Oct 2013 15:07:00 +0300
Cc: ciprianfhm@yahoo.com
Message-Id: <BDE0EF69-1ACB-4E96-861B-04881DD239AA@canah.com>
References: <f8e1b50337ceae3a1fa6ae5be0783a61@tina.happytour.ro>
To: Daniel Popa <daniel.popa@happytour.ro>
X-Mailer: Apple Mail (2.1283)

####################################

<s.paulik@govindanatur.de>: host mx51.mymxserver.com[188.94.251.25] said: 550

5.7.1 <server1.example.com>: Helo command rejected: Host not found (in
reply to RCPT TO command)
Reporting-MTA: dns; server1.example.com
X-Postfix-Queue-ID: E7152C1928
X-Postfix-Sender: rfc822; oana.suciu@canah.com
Arrival-Date: Fri, 4 Oct 2013 19:09:05 +0000 (UTC)

Final-Recipient: rfc822; s.paulik@govindanatur.de
Original-Recipient: rfc822;s.paulik@govindanatur.de
Action: delayed
Status: 4.7.1
Remote-MTA: dns; mx51.mymxserver.com
Diagnostic-Code: smtp; 550 5.7.1 <server1.example.com>: Helo command rejected:
Host not found
Will-Retry-Until: Wed, 9 Oct 2013 19:09:05 +0000 (UTC)

Return-Path: <oana.suciu@canah.com>
Received: from localhost (localhost [127.0.0.1])
by server1.example.com (Postfix) with ESMTP id E7152C1928
for <s.paulik@govindanatur.de>; Fri, 4 Oct 2013 19:09:05 +0000 (UTC)

X-Virus-Scanned: Debian amavisd-new at canah.com
Received: from server1.example.com ([127.0.0.1])
by localhost (canah.com [127.0.0.1]) (amavisd-new, port 10024)
with ESMTP id XokpdZrtE2Dy for <s.paulik@govindanatur.de>;
Fri, 4 Oct 2013 19:08:50 +0000 (UTC)

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