Re: sending a message failed

[Robert Pluim]

>>>>> On Thu, 13 Mar 2025 22:22:52 +0000, Leo Butler <Leo.Butler@umanitoba.ca> 
>>>>> said:

    Leo> On Thu, Mar 13 2025, gfp <gfp@posteo.at> wrote:
    >> Hi Gnus,
    >> 
    >> I wanted to reply to a mail and I got an error message:
    >> 
    >> Debugger entered--Lisp error: (error "Sending failed: 554 5.1.8
    >> <gfp@tuxedo.mail-host-ad...")
    >> error("Sending failed: %s" "554 5.1.8
    >> <gfp@tuxedo.mail-host-address-is-not-set...")

    Leo> Hello,

    Leo> The error message says `mail-host-address' is not set.
    Leo> You can customize the variable thus:

    Leo> M-x customize-variable mail-host-address RET

    Leo> I don't think the value matters too much. You could set it to a string
    Leo> that contains a non-routable FQDN, like "localhost.lan".

The value very much matters if the MTA does sender address validation,
which this one appears to be doing. based on the "5.1.8". You should
set it to be the same as your email addressʼ host, or set
`user-mail-address' correctly.

    Leo> In Gnus, you can inspect the mail headers by typing t in the message
    Leo> buffer. You can see what other Gnus users do by looking at the
    Leo> Message-ID header: the text to the right of the @-sign is the
    Leo> `mail-host-address' of that Gnus user.

Yes. But those people would have set `user-mail-address' to something
valid.

Robert
--