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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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