Date: Sun, 14 Mar 1999 01:42:34 +0100 From: "Lutz Rabing" <LutzRab@omc.net> To: freebsd-security@FreeBSD.ORG Subject: Re: sendmail NOQUEUE: ... didn't use HELO protocol Message-ID: <199903140042.BAA24413@office.omc.net> In-Reply-To: <4.1.19990313114523.0419f420@localhost> References: <199903131836.TAA21242@office.omc.net>
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> Congratulations. Your mailer just caught two spamming attempts and rejected > them. One attempted to use SMTP directly from an AOL dial-in (a common > source of spam); the other came in from a German ISP. Neither started > the transaction with a HELO (which means that they attempted to avoid > identifying themselves), and both attempted to relay through you. > > Since both were destined for the same place, it was probably the same > spammer trying twice. > What makes me nervous is, that the same spammer has access to hundreds of dialin accounts around the world, trying every 3 or 4 minutes around the clock. Always using "psl@earthling.net" as address. > At 07:36 PM 3/13/99 +0100, Lutz Rabing wrote: > > >Hi, > > > >we get many of these NOQUEUE messages in our maillog from many > >different dial-up accounts. One every 3 or 4 minutes. > > > >Has anyone seen something like this? Whats the purpose? > > > >I saw "NetBus online ..." in one of those mails. > > > > > >--------------------- > >Mar 13 19:25:21 delta sendmail[25150]: NOQUEUE: Authentication-Warning: > >delta.omc.net: pC19F8579.dip.t-online.de [19 > >3.159.133.121] didn't use HELO protocol > >Mar 13 19:25:21 delta sendmail[25150]: TAA25150: ruleset=check_rcpt, > >arg1=psl@earthling.net, relay=pC19F8579.dip.t-o > >nline.de [193.159.133.121], reject=550 psl@earthling.net... Relaying denied > >Mar 13 19:27:05 delta sendmail[25207]: NOQUEUE: Authentication-Warning: > >delta.omc.net: 166-7-61.ipt.aol.com [152.166 > >.7.61] didn't use HELO protocol > >Mar 13 19:27:06 delta sendmail[25207]: TAA25207: ruleset=check_rcpt, > >arg1=psl@earthling.net, relay=166-7-61.ipt.aol. > >com [152.166.7.61], reject=550 psl@earthling.net... Relaying denied > >--------------------- > > > > > >Thanks, > > > >Lutz Rabing -OMCnet- > > > > > > > >To Unsubscribe: send mail to majordomo@FreeBSD.org > >with "unsubscribe freebsd-security" in the body of the message > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-security" in the body of the message > > Mit freundlichen Gruessen, Lutz Rabing -OMCnet- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message
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