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Re: Can I by-pass my ISP to email?

Path csiph.com!x330-a1.tempe.blueboxinc.net!newsfeed.hal-mli.net!feeder1.hal-mli.net!nx01.iad01.newshosting.com!newshosting.com!novia!news-out.readnews.com!transit4.readnews.com!panix!not-for-mail
From Grant Edwards <invalid@invalid.invalid>
Newsgroups comp.os.linux.networking
Subject Re: Can I by-pass my ISP to email?
Date Tue, 16 Aug 2011 14:05:46 +0000 (UTC)
Organization PANIX Public Access Internet and UNIX, NYC
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On 2011-08-15, Richard Kettlewell <rjk@greenend.org.uk> wrote:

> The original claim was that MTAs reject mail from addresses which are
> not the target of an MX record.  Pascal's point is that this is nonsense
> because they'd have to discover the MX record given an IP address, which
> isn't possible.

In my experience, some SMTP servers look up the MX record for the host
name provided in the smtp "HELO" handshake.  The might also compare
that to the IP address that the connection is coming from -- but
that's less common since incoming and outgoing mail are often handled
by different machines.

-- 
Grant Edwards               grant.b.edwards        Yow! But was he mature
                                  at               enough last night at the
                              gmail.com            lesbian masquerade?

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Thread

Can I by-pass my ISP to email? "NoHtmlMailsPlease" <UsePlainText@dog.edu> - 2011-08-11 20:54 +0200
  Re: Can I by-pass my ISP to email? "Dave {Reply Address In.Sig}" <noone$$@llondel.org> - 2011-08-13 15:03 +0100
    Re: Can I by-pass my ISP to email? "NoHtmlMailsPlease" <UsePlainText@dog.edu> - 2011-08-14 08:45 +0200
      Re: Can I by-pass my ISP to email? Chris Davies <chris-usenet@roaima.co.uk> - 2011-08-14 13:49 +0100
      Re: Can I by-pass my ISP to email? "Dave {Reply Address In.Sig}" <noone$$@llondel.org> - 2011-08-14 16:19 +0100
        Re: Can I by-pass my ISP to email? unruh <unruh@wormhole.physics.ubc.ca> - 2011-08-15 02:38 +0000
  Re: Can I by-pass my ISP to email? Peter Köhlmann <peter-koehlmann@t-online.de> - 2011-08-13 16:17 +0200
  Re: Can I by-pass my ISP to email? Grant Edwards <invalid@invalid.invalid> - 2011-08-13 15:30 +0000
    Re: Can I by-pass my ISP to email? Pascal Hambourg <boite-a-spam@plouf.fr.eu.org> - 2011-08-13 19:31 +0200
      Re: Can I by-pass my ISP to email? unruh <unruh@wormhole.physics.ubc.ca> - 2011-08-14 11:44 +0000
        Re: Can I by-pass my ISP to email? Pascal Hambourg <boite-a-spam@plouf.fr.eu.org> - 2011-08-14 16:07 +0200
          Re: Can I by-pass my ISP to email? "Dave {Reply Address In.Sig}" <noone$$@llondel.org> - 2011-08-14 16:14 +0100
          Re: Can I by-pass my ISP to email? unruh <unruh@wormhole.physics.ubc.ca> - 2011-08-15 02:35 +0000
            Re: Can I by-pass my ISP to email? Richard Kettlewell <rjk@greenend.org.uk> - 2011-08-15 08:59 +0100
              Re: Can I by-pass my ISP to email? unruh <unruh@wormhole.physics.ubc.ca> - 2011-08-15 13:28 +0000
                Re: Can I by-pass my ISP to email? Richard Kettlewell <rjk@greenend.org.uk> - 2011-08-15 15:24 +0100
              Re: Can I by-pass my ISP to email? Grant Edwards <invalid@invalid.invalid> - 2011-08-16 14:05 +0000
  Re: Can I by-pass my ISP to email? Stefan Schmiedl <s@xss.de> - 2011-08-13 19:30 +0200
    Re: Can I by-pass my ISP to email? "NoHtmlMailsPlease" <UsePlainText@dog.edu> - 2011-08-14 09:11 +0200
  Re: Can I by-pass my ISP to email? Jorgen Grahn <grahn+nntp@snipabacken.se> - 2011-08-13 20:49 +0000
    Re: Can I by-pass my ISP to email? "NoHtmlMailsPlease" <UsePlainText@dog.edu> - 2011-08-14 09:52 +0200
  Re: Can I by-pass my ISP to email? unruh <unruh@wormhole.physics.ubc.ca> - 2011-08-14 11:41 +0000

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