From owner-freebsd-questions Tue Jun 6 13:14:45 2000 Delivered-To: freebsd-questions@freebsd.org Received: from psasolar.colltech.com (psasolar.colltech.com [208.229.236.14]) by hub.freebsd.org (Postfix) with ESMTP id 5BF5137B81B for ; Tue, 6 Jun 2000 13:14:41 -0700 (PDT) (envelope-from jmutter@colltech.com) Received: from localhost by psasolar.colltech.com (8.9.3/8.9.3/not) with ESMTP id PAA11216; Tue, 6 Jun 2000 15:14:20 -0500 (CDT) Date: Tue, 6 Jun 2000 15:14:19 -0500 (CDT) From: "James A. Mutter" X-Sender: jmutter@psasolar.private.psa.pencom.com To: Gabriel Ambuehl Cc: keith@mail.telestream.com, questions@FreeBSD.ORG Subject: Re: Spoofed mail In-Reply-To: <90470422972.20000606215646@buz.ch> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG > Tuesday, June 06, 2000, 9:50:49 PM, you wrote: > > Is there a method to prevent mail spoofs? What is to stop spamers from > > just scripting a telnet to port 25 and doing their deeds there? > > Configuring your SMTP to only allow users with the right to send > mail... The way to accomplish that depends on the mailserver you use. > Don't ask me anything about sendmail, qmail is ok though ;-) POP Before SMTP is a good way to do this. Force the users to comlete a valid POP transaction before accepting mail from that host. Sendmail, Postfix, and I'm guessing QMail all support this, with varying degrees of difficulty. -- Jim To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message