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How to stop spam in plesk

oim37

New Pleskian
Hello.

Recently, very often send spam through scripts using a third-party authorization (foreign) mail servers.
So there are complaints on the sender ip, which is the ip address of the site.

Here is a log where our allocated ip

As far as I understand in the malicious script is configured to authorize foreign mail servers, which later complained to us on these scripts.

How to deny it?

CLICK 'BACK' BUTTON TO RETURN TO SPAMCOP
################################################################################
Return-Path: <[email protected]>
Delivered-To: x
Received: from myhoster.ru (unknown [189.111.21.11])
by mail110.syd.optusnet.com.au (Postfix) with SMTP id ABCE7780EF7
for <x>; Fri, 1 Jan 2016 11:37:16 +1100 (AEDT)
Date: Fri, 1 Jan 2016 03:37:30 -0700
Subject: You have deferred notifications waterway
Ballrooms-Assessing-Cryptographic: 323
Latching-Maybe-Score: FD63141DACB922B5
Promulgating-Constructible-Backlog: caligula
Message-ID: <[email protected]>
Content-Type: text/html; charset=UTF-8
MIME-Version: 1.0
From: YouTube Service <[email protected]>
Inclose-Quantum-Disengages: 8fb342e23cf1c756
Content-Transfer-Encoding: 7bit
X-Priority: 1
Adjourning-Madame-Salvatore: messily
To: "x" <x>
X-Optus-CM-Spam: spam
X-Optus-CM-Score: 100
X-Optus-CM-Analysis: v=2.1 cv=cK4dyQqN c=1 sm=1 tr=0 p=GuF-mbZhAAAA:8
p=RCAvVMt7Idphq-Y2:21 a=C82YrFrMTpAMApErilEMCA==:117
a=C82YrFrMTpAMApErilEMCA==:17 a=-32Nv5wAAAAA:8 a=PO7r1zJSAAAA:8
a=n4oCZjbuAAAA:8 a=IkcTkHD0fZMA:10 a=ybN8FLgBPWh4M_VL9UEA:9
a=QEXdDO2ut3YA:10 a=_W_S_7VecoQA:10 a=1-zPgXl5yukA:10

<html>
<head>

Use Plesk 12.5
 
In addition to the outgoing mail control mentioned earlier by IgorG.

Block the outgoing port 25 on your server and setup a relay on a non-standard port. This will allow outgoing mail using the sendmail binary or the mail() function of PHP. It will not allow scripts to use foreign mail servers on port 25.
 
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