Date: Mon, 28 Jan 2008 17:56:39 -0800 From: Jeremy Chadwick <koitsu@FreeBSD.org> To: Gary Kline <kline@thought.org> Cc: FBSD Ports Mailing List <freebsd-ports@freebsd.org> Subject: Re: mail strangeness. Message-ID: <20080129015639.GA80761@eos.sc1.parodius.com> In-Reply-To: <200801281728.24462.kline@thought.org> References: <200801281728.24462.kline@thought.org>
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On Mon, Jan 28, 2008 at 05:28:24PM -0800, Gary Kline wrote: > Much closer to getting local mail [[ from tao.thought.org]] working. so far, > no mail, not even to test@freebsd.org gets thru. If tis does, can anyone > explain the appended lines from /var/log/maillog....??? WHY is the "Helo > command rejected: Host not found"? sendmail *is* rewriting my > <from=> linee to just "kline@THOUGHT.ORG" (sic) . All caps intentionally. > So far, I'm reaching friends, family, and elsewhere. > > Jan 28 17:15:11 tao sm-mta[31683]: m0SMD6LO031117: > to=<freebsd-questions@FreeBSD.ORG>, ctladdr=<kline@tao.thought.org> > (1002/1002), delay=03:02:05, xdelay=00:00:01, mailer=esmtp, pri=661432, > relay=mx1.freebsd.org. [69.147.83.52], dsn=4.7.1, stat=Deferred: 450 4.7.1 > <tao.thought.org>: Helo command rejected: Host not found This means that during the initial SMTP conversation, the following happened: * machine claiming to be tao.thought.org connects to mx1.freebsd.org * tao.thought.org states HELO tao.thought.org * mx1.freebsd.org looks up the DNS A record of tao.thought.org * There is no such A record, so the SMTP server says sod off. You either need to make tao.thought.org actually have an A record (if you're authoritative for that domain and have such abilities), or, you need to pick a HELO hostname that actually resolves to something the rest of the Internet can do lookups on. Also, don't try to be sneaky and use something that resolves to a reserved address (127/8, 192.168.0/16, etc.), because mailers will also reject that assuming they use RHSBLs like bogusmx.rfc-ignorance.org or dsn.rfc-ignorant.org. Hope this helps, and welcome to present-day SMTP on the Internet, where it's like pulling teeth (thanks, spammers!) -- | Jeremy Chadwick jdc at parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB |
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