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Re: ISP update breaks Hermes

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Bob Latham <bob@sick-of-spam.invalid> wrote:
> The xentric (or whatever its called) people told me my problem is in
> the helo message but having got passed the issues of certificates and
> AcornSSL it is not preventing me posting so I have time to fiddle.
> 
> Their error log tells me to look at certain rfc specs and that tells
> me that the helo needs to be either an ip address in square brackets
> [x.x.x.x] or an FQDN. The logs from Hermes shows that mine is neither
> at the moment. My best efforts to change that in RISC OS not Hermes
> didn't do anything according to Hermes logs. I'm working on it...
> 
> I'm at a loss to understand why the "local domain" field is greyed
> out unless you have "try name server too" ticked. The whole local
> domain thing makes zero sense to me.

I think you're conflating two things.  The HELO/EHLO is something said
during the SMTP handshaking - I type 'HELO example.wibble' when connecting
to the SMTP server:

$ nc -v Server2.xencentrichosting.uk 25
Connection to Server2.xencentrichosting.uk (193.35.57.251) 25 port [tcp/smtp] succeeded!
220 server2.xencentrichosting.uk ESMTP Exim 4.98.2 Thu, 24 Jul 2025 10:46:29 +0100
HELO example.wibble
250 server2.xencentrichosting.uk Hello example.wibble [redacted.my.publicip.address]
QUIT
221 server2.xencentrichosting.uk closing connection

That's entirely different from anything set in your machine's IP address
config for talking to the local network.

Perhaps Xencentric are deciding that anyone who declares themselves to be a
made up name like example.wibble is a spammer and blocking them.

> Yes, I do know that Hermes can set the helo for each smtp server it
> connects to and no, I'm not using that feature at the moment.

Try using that.  Thunderbird sends the string 'ehlo.thunderbird.net' to
any server (in order to avoid leaking the local IP address):
https://support.mozilla.org/en-US/kb/thunderbird-smtp-ehlo

You could tell Hermes to use the same.  At least then it would be identical
to a popular mail client.


There's a second issue with Server2.xencentrichosting.uk specifically that
it's using a self-signed certificate, but I suspect that might be different
with the mail.yourdomain.com servers.  So may not be relevant in your case.

Theo

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ISP update breaks Hermes Bob Latham <bob@sick-of-spam.invalid> - 2025-07-23 11:37 +0100
  Re: ISP update breaks Hermes Theo <theom+news@chiark.greenend.org.uk> - 2025-07-23 13:12 +0100
    Re: ISP update breaks Hermes Martin <News03@avisoft.f9.co.uk> - 2025-07-23 13:21 +0100
      Re: ISP update breaks Hermes Chris Hughes <news13@noonehere.co.uk> - 2025-07-23 13:47 +0100
        Re: ISP update breaks Hermes Bob Latham <bob@sick-of-spam.invalid> - 2025-07-23 15:58 +0100
      Re: ISP update breaks Hermes Bob Latham <bob@sick-of-spam.invalid> - 2025-07-23 15:56 +0100
    Re: ISP update breaks Hermes Bob Latham <bob@sick-of-spam.invalid> - 2025-07-23 15:55 +0100
      Re: ISP update breaks Hermes Chris Hughes <news13@noonehere.co.uk> - 2025-07-23 17:28 +0100
        Re: ISP update breaks Hermes Bob Latham <bob@sick-of-spam.invalid> - 2025-07-23 19:24 +0100
  Re: ISP update breaks Hermes Chris Hughes <news13@noonehere.co.uk> - 2025-07-23 13:20 +0100
    Re: ISP update breaks Hermes Bob Latham <bob@sick-of-spam.invalid> - 2025-07-23 16:08 +0100
      Re: ISP update breaks Hermes Chris Hughes <news13@noonehere.co.uk> - 2025-07-23 17:37 +0100
        Re: ISP update breaks Hermes Bob Latham <bob@sick-of-spam.invalid> - 2025-07-23 19:18 +0100
          Re: ISP update breaks Hermes Chris Hughes <news13@noonehere.co.uk> - 2025-07-23 21:09 +0100
            Re: ISP update breaks Hermes Bob Latham <bob@sick-of-spam.invalid> - 2025-07-24 08:47 +0100
              Re: ISP update breaks Hermes Theo <theom+news@chiark.greenend.org.uk> - 2025-07-24 10:59 +0100
                Re: ISP update breaks Hermes Bob Latham <bob@sick-of-spam.invalid> - 2025-07-24 19:53 +0100
                Re: ISP update breaks Hermes Theo <theom+news@chiark.greenend.org.uk> - 2025-07-24 22:22 +0100
                Re: ISP update breaks Hermes Bob Latham <bob@sick-of-spam.invalid> - 2025-07-25 08:47 +0100
                Re: ISP update breaks Hermes Theo <theom+news@chiark.greenend.org.uk> - 2025-07-25 16:59 +0100

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