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Groups > uk.telecom.broadband > #57269

Re: Broadband Over the Mobile Network

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Jeff Gaines <jgnewsid@outlook.com> wrote:
> On 21/05/2026 in message <6Qv*Le8GA@news.chiark.greenend.org.uk> Theo wrote:
> 
> >Graham J <nobody@nowhere.co.uk> wrote:
> >>Jeff Gaines wrote:
> >>
> >>[snip]
> >>
> >>>Does anybody here have this sort of service? If so is it something that
> >>>you get used to? It's quite a different way of working.
> >>
> >>Be aware that most mobile networks use CGNAT.  Professional email
> >>services may reject connections coming from CGNAT because it allows
> >>multiple users per public IP, and some of those users will (perhaps
> >>unkowingly) send "unsavoury material".
> >>
> >>It is possible to get a static public IP but it won't be at the entry
> >>level price.
> >
> >I would expect email to be going via an email provider like Gmail, Outlook,
> >or a hosting company's SMTP server.  Are you saying those may block genuine
> >authenticated users connecting via CGNAT?
> >
> >Running your own SMTP server which routes direct to the recipient from
> >behind an ISP connection is a recipe for trouble nowadays, CGNAT or no
> >CGNAT.  So don't do that.
> >
> >Theo
> 
> My email program (eM Client) sends/collects email directly from my own 
> domains hosted by Heart Internet and Mythic Beasts.

That's presumably sending indirectly via the smarthost at Heart or Mythic. 
ie to send an email to bob@example.com it sends it to Mythic's server, who
decide which server hosts example.com and then sends it there.  You'd
configure the name of the server like smtp-auth.mythic-beasts.com in eM
Client.  It's the reputation of the IP of smtp-auth.mythic-beasts.com that
matters to the recipient server, and presumably Mythic have done the
necessary to make it have a good reputation and not be on blacklists.

If your email program is skipping that step, instead looking up the MX
record for example.com and sending the email direct from your home IP to the
destination server, that's when you are likely to fall foul of 'residential
IP' spam blacklists.  Email clients (since 1990s) don't do this, but if you
run a mailserver at home then you might configure it that way.

That's why it doesn't matter if your home IP is on a spam blacklist, because
the mail is forwarded via the smarthost and the recipient doesn't see your
home IP, CGNAT or otherwise.

Theo

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Broadband Over the Mobile Network "Jeff Gaines" <jgnewsid@outlook.com> - 2026-05-21 09:15 +0000
  Re: Broadband Over the Mobile Network Theo <theom+news@chiark.greenend.org.uk> - 2026-05-21 10:41 +0100
    Re: Broadband Over the Mobile Network "Jeff Gaines" <jgnewsid@outlook.com> - 2026-05-21 10:05 +0000
      Re: Broadband Over the Mobile Network Tweed <usenet.tweed@gmail.com> - 2026-05-21 10:16 +0000
      Re: Broadband Over the Mobile Network Roger Mills <mills37.fslife@gmail.com> - 2026-05-21 15:07 +0100
    Re: Broadband Over the Mobile Network Mark Undrill <spam@invalid.invalid> - 2026-05-21 11:17 +0100
  Re: Broadband Over the Mobile Network Graham J <nobody@nowhere.co.uk> - 2026-05-21 12:34 +0100
    Re: Broadband Over the Mobile Network Theo <theom+news@chiark.greenend.org.uk> - 2026-05-21 14:11 +0100
      Re: Broadband Over the Mobile Network "Jeff Gaines" <jgnewsid@outlook.com> - 2026-05-21 13:19 +0000
        Re: Broadband Over the Mobile Network Theo <theom+news@chiark.greenend.org.uk> - 2026-05-21 15:06 +0100
          Re: Broadband Over the Mobile Network Graham J <nobody@nowhere.co.uk> - 2026-05-21 22:09 +0100
            Re: Broadband Over the Mobile Network Theo <theom+news@chiark.greenend.org.uk> - 2026-05-22 00:01 +0100
              Re: Broadband Over the Mobile Network Tweed <usenet.tweed@gmail.com> - 2026-05-22 05:43 +0000
              Re: Broadband Over the Mobile Network Graham J <nobody@nowhere.co.uk> - 2026-05-22 08:22 +0100
                Re: Broadband Over the Mobile Network Tweed <usenet.tweed@gmail.com> - 2026-05-22 07:36 +0000
                Re: Broadband Over the Mobile Network Graham J <nobody@nowhere.co.uk> - 2026-05-22 09:15 +0100
                Re: Broadband Over the Mobile Network "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-05-22 21:47 +0100
                Re: Broadband Over the Mobile Network Chris <ithinkiam@gmail.com> - 2026-05-23 10:09 +0000
                Re: Broadband Over the Mobile Network Tweed <usenet.tweed@gmail.com> - 2026-05-23 10:32 +0000
                Re: Broadband Over the Mobile Network "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-05-23 20:48 +0100
                Re: Broadband Over the Mobile Network Tweed <usenet.tweed@gmail.com> - 2026-05-24 06:11 +0000
                Re: Broadband Over the Mobile Network "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-05-24 11:27 +0100
                Re: Broadband Over the Mobile Network Tweed <usenet.tweed@gmail.com> - 2026-05-24 11:18 +0000
                Re: Broadband Over the Mobile Network "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-05-24 14:18 +0100
                Re: Broadband Over the Mobile Network David Rance <david@SPAMOFF.invalid> - 2026-05-24 18:37 +0100
                Re: Broadband Over the Mobile Network Chris <ithinkiam@gmail.com> - 2026-05-24 22:10 +0000
                Re: Broadband Over the Mobile Network Richmond <dnomhcir@gmx.com> - 2026-05-25 10:21 +0100
                Re: Broadband Over the Mobile Network "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-05-24 10:58 +0100
                Re: Broadband Over the Mobile Network "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-05-24 11:29 +0100
      Re: Broadband Over the Mobile Network Graham J <nobody@nowhere.co.uk> - 2026-05-21 14:23 +0100
        Re: Broadband Over the Mobile Network Theo <theom+news@chiark.greenend.org.uk> - 2026-05-21 15:15 +0100
          Re: Broadband Over the Mobile Network Graham J <nobody@nowhere.co.uk> - 2026-05-21 22:16 +0100
      Re: Broadband Over the Mobile Network Chris <ithinkiam@gmail.com> - 2026-05-21 14:12 +0000
      Sending email from own server (was: Broadband Over the Mobile Network) Geoff Clare <geoff@clare.See-My-Signature.invalid> - 2026-05-22 13:59 +0100
        Re: Sending email from own server Graham J <nobody@nowhere.co.uk> - 2026-05-22 14:20 +0100
          Re: Sending email from own server Tweed <usenet.tweed@gmail.com> - 2026-05-22 15:23 +0000
            Re: Sending email from own server Graham J <nobody@nowhere.co.uk> - 2026-05-22 20:03 +0100
    Re: Broadband Over the Mobile Network David Wade <g4ugm@dave.invalid> - 2026-05-21 19:01 +0100
  Re: Broadband Over the Mobile Network Chris <ithinkiam@gmail.com> - 2026-05-21 13:26 +0000
  Re: Broadband Over the Mobile Network Java Jive <java@evij.com.invalid> - 2026-05-21 15:18 +0100
  Re: Broadband Over the Mobile Network Jason H <jason_hindle@yahoo.com> - 2026-05-30 09:29 +0000
    Re: Broadband Over the Mobile Network "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-05-30 13:43 +0100
    Re: Broadband Over the Mobile Network Woody <harrogate3@ntlworld.com> - 2026-05-30 15:54 +0100
      Re: Broadband Over the Mobile Network Andy Burns <usenet@andyburns.uk> - 2026-05-30 16:01 +0100
        Re: Broadband Over the Mobile Network Woody <harrogate3@ntlworld.com> - 2026-05-30 20:12 +0100
      Re: Broadband Over the Mobile Network "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-05-30 17:22 +0100
      Re: Broadband Over the Mobile Network Richmond <dnomhcir@gmx.com> - 2026-05-30 17:25 +0100
        Re: Broadband Over the Mobile Network David Wade <g4ugm@dave.invalid> - 2026-05-30 17:51 +0100

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