From owner-freebsd-questions Thu Sep 27 11:57:20 2001 Delivered-To: freebsd-questions@freebsd.org Received: from khan.peak.org (khan.peak.org [198.88.144.26]) by hub.freebsd.org (Postfix) with ESMTP id C5B1F37B416 for ; Thu, 27 Sep 2001 11:57:15 -0700 (PDT) Received: from peak.org (nobody@mccoy.peak.org [206.163.129.2]) by khan.peak.org (8.9.3/8.9.3) with SMTP id LAA28357; Thu, 27 Sep 2001 11:55:57 -0700 Received: from 24.136.36.40 (SquirrelMail authenticated user luomat) by emh.peak.org with HTTP; Fri, 28 Sep 2001 03:08:08 -0700 (PDT) Message-ID: <3374.24.136.36.40.1001671688.squirrel@emh.peak.org> Date: Fri, 28 Sep 2001 03:08:08 -0700 (PDT) Subject: Re: What does 'NOQUEUE: Null connection from ' mean? From: "Timothy J. Luoma" To: mshaber@awaretech.com In-Reply-To: <5.0.2.1.2.20010927142546.02a15e80@mail.awaretech.com> References: <5.0.2.1.2.20010927142546.02a15e80@mail.awaretech.com> Cc: freebsd-questions@FreeBSD.ORG Reply-To: luomat@peak.org X-Mailer: SquirrelMail (version 1.0.3) MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG > What exactly does "NOQUEUE: Null connection from " mean? I > have seen these entries in my maillog infrequently, and I am concerned > that someone may be trying to compromise my system. I think it happens when someone connects to your machine and tests whether or not it will relay mail not to your domain. Try this: telnet localhost 25 helo there mail from: rcpt to: (I may have the mail and rcpt lines reversed). Sendmail should then say something like "relaying denied" at which point you will control ] out of sending the mail, and check the log... I bet you see the same error. TjL To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message