From owner-freebsd-isp Tue Mar 7 22:10:45 2000 Delivered-To: freebsd-isp@freebsd.org Received: from misery.sdf.com (misery.sdf.com [204.244.213.49]) by hub.freebsd.org (Postfix) with ESMTP id 5439737B68E for ; Tue, 7 Mar 2000 22:10:43 -0800 (PST) (envelope-from tom@sdf.com) Received: from tom (helo=localhost) by misery.sdf.com with local-esmtp (Exim 2.12 #1) id 12SZd6-0001Dn-00; Tue, 7 Mar 2000 22:07:32 -0800 Date: Tue, 7 Mar 2000 22:07:31 -0800 (PST) From: Tom To: lambert@cswnet.com Cc: freebsd-isp@freebsd.org Subject: Re: Am I being spammed? Or is egroups this impolite? In-Reply-To: <200003080348.VAA04996@radius2.csw.net> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-isp@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org On Tue, 7 Mar 2000 lambert@cswnet.com wrote: > Hi, > > I have an immediate problem wherein I am seeing a heinous number of > sumultanious connects claiming to be from egroups.com. > > The IPs are in the 208.50.144, 208.48.218, and 208.49.160 Class-Cs. I > cannot lookup by name these connections. > > Is this standard practice for egroups or had somebody faked up a lot of > DNS? > > This barrage has brought both my MX servers to their knees. EGroups sends e-mail to a mailing list sorted by domain. They use Qmail, so they send to one recipient per connection. So if you have a 100 people at your domain get EGroups e-mail, in a short period of time, EGroups will open a 100 connections to your mail server(s). Hopefully you can handle it. This results in a EGroups cutting a swath through the internet every time they do a mailing. You should probably set your maximum connection limit to something that your servers can handle. Switching from Sendmail to Postfix should help. Tom To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message