On Thu, Mar 13 2025, gfp <[email protected]> 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 > <[email protected]...") > error("Sending failed: %s" "554 5.1.8 > <[email protected]...")
Hello, The error message says `mail-host-address' is not set. You can customize the variable thus: M-x customize-variable mail-host-address RET I don't think the value matters too much. You could set it to a string that contains a non-routable FQDN, like "localhost.lan". In Gnus, you can inspect the mail headers by typing t in the message buffer. You can see what other Gnus users do by looking at the Message-ID header: the text to the right of the @-sign is the `mail-host-address' of that Gnus user. HTH, Leo
