I'll answer to myself.
The problem was related to the FROM value and not the AUTH option value.
The smarthost (who has the domain2 as local domain) checked for the
username root@domain2 into its users before it accepted the email, and
since the user was not there, it rejected the email.
Now the problem is solved.
Regards,
Federico Petronio wrote:
> Hello,
>
> I write to you to ask for help in the following subject: I had
> configured an Exim MTA under Debian 3.1 to work in mode "mail sent by
> smarthost; received via SMTP or fetchmail". I need the server to send
> all emails to external domains to a smarthost (which requires AUTH
> PLAIN) and the emails to local accounts to be kept in the server.
>
> After some testing I notice that the emails are not delivered to the
> smarthost and they bounce with this error:
>
> ---
> This message was created automatically by mail delivery software.
>
> A message that you sent could not be delivered to one or more of its
> recipients. This is a permanent error. The following address(es) failed:
>
> user@domain1
> SMTP error from remote mailer after MAIL FROM:<root@domain2> SIZE=1376
> AUTH=root@???:
> host smtp.domain3 [xxx.xxx.xxx.xxx]:
> 554 Sorry, no mailbox here by that name. (#5.1.1)
> ---
>
>
> Where user@domain1 is the original recipient, root@???
> is the local account that executed the "mail" command to send the email,
> and smtp.domain3 is the smarthost.
>
> Is there any way to disable that option and use plain MAIL FROM
> commands? What is that option intended to? It's not clear to me why Exim
> set "root@???" in the AUTH option event when the
> authentication was made with some other username.
>
> Thank you very much in advance for any help.
>
> Regards,
>
--
Federico Petronio
petrus@???
