From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on inbox.vuxu.org X-Spam-Level: X-Spam-Status: No, score=-1.2 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,DKIM_VALID_EF,MAILING_LIST_MULTI,RCVD_IN_DNSWL_NONE autolearn=ham autolearn_force=no version=3.4.2 Received: from minnie.tuhs.org (minnie.tuhs.org [45.79.103.53]) by inbox.vuxu.org (OpenSMTPD) with ESMTP id f10af97f for ; Wed, 26 Jun 2019 02:50:36 +0000 (UTC) Received: by minnie.tuhs.org (Postfix, from userid 112) id B75589BF72; Wed, 26 Jun 2019 12:50:34 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id 245DE9BD84; Wed, 26 Jun 2019 12:50:25 +1000 (AEST) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=tuhs.org; s=dkim; t=1561517427; bh=IyfNcL/isKUzCe3cB+9eNz9oAfvlsL6lxpy7liT5doc=; h=Date:From:To:References:In-Reply-To:Subject:List-Id: List-Unsubscribe:List-Archive:List-Post:List-Help:List-Subscribe: Cc:From; b=YOBuwBPgogQy0ijHT62aKiYsmrab5SOmQGaqF/xR08GmTtshmuUfDw2kNYMU6NICG 5nhAGTQAvmKNsTo0tf0yKo1MYI1AXV9Q9/eFKqk6tq8cuoB/g5oB9kUvTsH19lneMx AIAbmdVv250Su704v/h3AksiKnsYIZXgatepEoJM= Received: by minnie.tuhs.org (Postfix, from userid 1000) id A06309BD16; Wed, 26 Jun 2019 12:50:23 +1000 (AEST) Date: Wed, 26 Jun 2019 12:50:23 +1000 From: Warren Toomey To: Dave Horsfall Message-ID: <20190626025023.GA17457@minnie.tuhs.org> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.9.4 (2018-02-28) Subject: Re: [TUHS] Testing Mail Connectivity X-BeenThere: tuhs@minnie.tuhs.org X-Mailman-Version: 2.1.26 Precedence: list List-Id: The Unix Heritage Society mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: The Eunuchs Hysterical Society Errors-To: tuhs-bounces@minnie.tuhs.org Sender: "TUHS" On Wed, Jun 26, 2019 at 10:26:31AM +1000, Dave Horsfall wrote: > Are you still here, Warren? I did email you, but no reply so far (and no > reject either, otherwise I would've spotted *that* too). All, sorry for the off-topic reply and query. I'm posting this here so that Dave can read it in the web archive. I'm guessing the problem is the one Dave identified earlier: > You need to grok Sendmail's log format (and SMTP in general), but it means > that Minnie connected to my server, waited the requisite time for the greeting > banner, and then shat herself when she saw my ginormous banner and dropped the > connection without so much as a good-bye... i.e.a multiline response to the HELO/EHLO which meets the RFC specs. > That simple measure, along with the greeting pause and some simple RFC DNS > checks, block a lot of the crap. I've just subscribed to the Postfix mailing list, and I'll ask on there if there is a configuration change I can make to allow my Postfix client to deal properly with Dave's multiline HELO/EHLO response. And why it can't at present. But if someone here already knows, could they let me know?! Thanks! Warren