Date: Mon, 6 Mar 2017 18:43:57 +0000 From: RW <rwmaillists@googlemail.com> To: freebsd-questions@freebsd.org Subject: Re: Off topic: smtp HELO question Message-ID: <20170306184357.60de652b@gumby.homeunix.com> In-Reply-To: <58BD9DC2.9020802@sneakertech.com> References: <58BD94BD.9020405@sneakertech.com> <1350d47b-5723-5171-3cd9-27e9b02aeb8b@FreeBSD.org> <58BD9DC2.9020802@sneakertech.com>
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On Mon, 06 Mar 2017 12:34:58 -0500 Quartz wrote: > > So if your NAT transforms internal addresses to W.X.Y.Z and a > > reverse lookup 'host W.X.Y.Z' returns 'foo.example.com' then you > > should configure your mail client to EHLO as 'foo.example.com' > > OK thanks, that's kinda what I was expecting. Unfortunately for me, > my external address floats around depending on what my ISP gives me, > so I can't configure a static name in my client to match that. For > now I'm trying to see what happens if I set it to the name of my > domain I own, but the servers that host that aren't the ones I send > mail through. Don't bother with this. > > >For mail submission you generally > > identify yourself by logging into the server after switching your > > connection to TLS, > > I do use TLS, but what I'm trying to debug is not so much that the > email service *I* use checks, but that the final receiving server > scans through the headers and flags anything with a NAT address. It's probably not that. I suggest you try: https://www.mail-tester.com/ it may reveal what the problem is, unless it's just a BOFH on the receiving end doing something very odd.
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