[nos-bbs] How to avoid SMTP spam mail in mqueue

[Michael E Fox - N6MEF]

Block direct inbound SMTP connections to JNOS.  

Set up an MX in Linux using all the modern spam avoidance mechanisms dynamic
black lists, UBE detection, signature-based detection, etc.) and send all
inbound email to JNOS through that mail server using an MX record in DNS.  

 

Michael

N6MEF

 

 

From: nos-bbs-bounces at tapr.org [mailto:nos-bbs-bounces at tapr.org] On Behalf
Of Jose Ng Lee
Sent: Sunday, March 16, 2014 10:55 PM
To: TAPR xNOS Mailing List
Subject: [nos-bbs] How to avoid SMTP spam mail in mqueue

 

I noticed today my Raspberry Pi Jnos was respawing in every few minutes.
So, I checked and found out there was some spam e-mails in mqueue not been
able to deliver and causing the system to crash and respawn.  Deleted those
e-mails and checking the logs and put in blacklist the offender IPs.

 

I play with 3 Jnos systems:

 

Main systems PC with Linux Ubuntu 12.04 LTS: onx.hp2at.ampr.org

No spam mail in mqueue.

 

Raspberry Pi with Raspbian: hp2ng.ampr.org

Few spam mail in mqueue.

 

PC with Centos 5.9: hp2sa.ampr.org

THOUSANDS of spam mail in mqueue.  Don't know how this got through or why it
was received in JNOS.  The autoexec.nos is the same as my other system.

 

This is on the message heading on one mail:

 

Received: from pc-200402271018 by hp2sa.ampr.org (ONXSA BBS) with SMTP
        id AA24803 ; Thu, 13 Mar 2014 03:17:52 EST
From: =?BIG5?B?pWqo5a21vNY=?= <springboard at yahoo.com
<mailto:springboard at yahoo.com> >
To: "awze" <awze at awze.com <mailto:awze at awze.com> >
Subject:
 =?BIG5?B?RGlzbmV5qOC1o7nPrtGhQqlfpf2lzaeupHCpaiC1paqpxXao7LTBuc+u0aFCpfq6?=
 =?BIG5?B?0KRqpViyTaFJ?=
Date: Wed, 28 Apr 2004 22:58:06 +0800
MIME-Version: 1.0
Content-Type: text/html;
        charset="Big5"
Content-Transfer-Encoding: quoted-printable
X-Priority: 3
X-MSMail-Priority: Normal
X-Mailer: Microsoft Outlook Express 6.00.2800.1106
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106
Message-Id: <24804 at hp2sa.ampr.org <mailto:24804 at hp2sa.ampr.org> >

Took this JNOS offline until the problem solve.

 

Please can anyone know a way to deny receiving spam mail in jnos.

 

Thanks,

José / HP2AT

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