RE: [Solved] SMTP standards : needs outgoing SMTP server be MX fo r my domain?
Thanks very much for your replies guys.
The problem was actually something else, much more conventional (an old NAT
rule forgotten, a public IP migration, and old IP range DNS records
expiring). So the problem was on my side, they were only checking reverse
lookup...
A document they sent me made me thought of what I posted.
Sorry for bothering, and thanks!
Vincent
> -----Original Message-----
> From: Jeremy T. Bouse [mailto:jbouse@debian.org]
> Sent: Wednesday 18 December 2002 17:35
> To: debian-user@lists.debian.org
> Subject: Re: SMTP standards : needs outgoing SMTP server be MX for my
> domain?
>
>
> This could be an internal policy decision on their part... In
> which case I would assume that the proper response back would be an
> x.7.1 which states it's policy... Either 4.7.1 if it's not fatal or
> 5.7.1 if it is...
>
> There is nothing that I am aware of that stipulates what an MTA
> administrator can and can not set as internal policy for mail they are
> willing to receive... In fact I'm in the process of designing
> a Sendmail
> milter for our network at work to enforce the policies we're putting
> into place... One idea for it is to actually lookup the MX server for
> the incoming domain and very the FROM address really is
> valid... Now if
> everyone accepted VRFY this would be easy but is not the case
> thanks to
> spammers which have caused many MTA admins to turn that
> feature off...
>
> Another simple way to catch many spammers is to actually check
> the HELO arguments and either later reject the message or just discard
> it if the argument is not either 1) a valid FQDN, 2) domain name or 3)
> IP address in proper notation... I've found many spammers just sending
> random characters, as well as yahoo.com, hotmail.com, etc are popular
> and even a few give my MTA my MTA's own IP address...
>
> Internal policy is internal policy and you can't really twist
> their hand to change it...
>
> Jeremy
>
> On Wed, Dec 18, 2002 at 04:08:59PM +0100, DEFFONTAINES Vincent wrote:
> > An organization refuses emails from my domain, under this reason :
> > My domain's mailer that connects to their SMTP server is
> not MX of my
> > domain.
> >
> > Indeed it is not, I have different hosts for ingoing and
> outgoing email
> > traffic.
> > Actually, I see no good reason why outgoing mailer should
> be the same as MX.
> >
> > I am wondering if SMTP standards require that email sender
> of a domain be
> > its MX? I find that really surprising.
> >
> > I'll be glad to know if anyone can enlight me.
> >
> > Thanks,
> >
> > Vincent
> >
> >
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