From owner-freebsd-questions@FreeBSD.ORG Thu May 25 15:11:26 2006 Return-Path: X-Original-To: freebsd-questions@freebsd.org Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 94FFF16A61E for ; Thu, 25 May 2006 15:11:22 +0000 (UTC) (envelope-from wmoran@collaborativefusion.com) Received: from mx00.pub.collaborativefusion.com (mx00.pub.collaborativefusion.com [206.210.89.199]) by mx1.FreeBSD.org (Postfix) with ESMTP id BF8E543DDF for ; Thu, 25 May 2006 15:10:58 +0000 (GMT) (envelope-from wmoran@collaborativefusion.com) Received: from localhost (monrovll-cuda1-24-53-251-44.pittpa.adelphia.net [24.53.251.44]) (AUTH: LOGIN wmoran, TLS: TLSv1/SSLv3,256bits,AES256-SHA) by wingspan with esmtp; Thu, 25 May 2006 11:11:01 -0400 id 00056407.4475C905.00005208 Date: Thu, 25 May 2006 11:10:57 -0400 From: Bill Moran To: Olga Zenkova Message-Id: <20060525111057.7948622e.wmoran@collaborativefusion.com> In-Reply-To: <20060525145312.50581.qmail@web53406.mail.yahoo.com> References: <20060525145312.50581.qmail@web53406.mail.yahoo.com> Organization: Collaborative Fusion X-Mailer: Sylpheed version 1.0.6 (GTK+ 1.2.10; i386-portbld-freebsd6.1) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Cc: freebsd-questions@freebsd.org Subject: Re: Spam problem! X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 25 May 2006 15:11:33 -0000 Olga Zenkova wrote: > I use sendmail 8.13.3 and gather full log of its work. > I see such strings in it: > > <<< RCPT TO: user1@domain.com > >>> 250 2.1.5 ... Recipient ok > <<< RCPT TO: user2@domain.com > >>> 250 2.1.5 ... Recipient ok > <<< DATA > <<< To: user3@domain.com > > where user1, user2 - users names > domain.com - domain name > > After that user1 and user2 get spam letters to their > mailboxes with field "To: user3" in it. There are no > user1 or user2 in this field. Is it possible to cut > off these letters? Especially it is difficult to > explain for user1 and user2 why they got letters > addressed not for them. Spam prevention is a _huge_ topic. Mainly because everything and anything you do to try to prevent spam, spammers will work to circumvent. I would suggest lots and lots of reading on the problem. Research spamcop, spamassassin, greylisting to start, plus any links that those point you to. You've got a lot of work on your hands to understand the problem and effectively prevent it. Alternatively, you can purchase a commercial solution. There are many appliances available. Or you could hire an experienced consultant to set up spam blocking on your existing server. Good luck. -- Bill Moran Time for some thrilling heroics. Jayne Cobb