My BSD wrote:
> Good day!
> 
> Set up v. 4.69 (compiled from source) on Ubuntu Hardy box with a fully
> qualified domain name (with proper RDNS) for the purpose of delivering
> outgoing business mail from local users.
> 
> Local users do not have local accounts, instead, they have accounts on
> an external E-Mail host with corresponding entries in the aliases file 
> pointing to their external accounts, as follows:
> 
> user1:        [email protected]
> user2:        [email protected]
>  ,,,
> 
> Messages from one local user to another are forwarded to the local user's
> external account without incident.
> 
> But local delivery error messages are frozen with the following log entries:
> 
> -----------------------------------------------------------------------------------------------------------
> 2009-05-26 04:16:49 1M8rq5-0003kh-LJ ** [[email protected]] 
> <[[email protected]]>: Unknown user
> 
> 2009-05-26 04:16:49 1M8rq5-0003kh-LJ Frozen (delivery error message)"
> -----------------------------------------------------------------------------------------------------------
> 
> Any ideas?
> 

"  Local users do not have local accounts, "

Look at your routers and the transports they call.

- why would one of those ID's - by definition, with '..no local account'
   be latched-on-to for local delivery at all?

- and if/as/when it is, *where* would Exim expect to deliver it?

NOT having 'local accounts' as in shell login, a /home/<usrname> dirtree, or
an mbox or maildir under /var/mail/<username> is fine.

But if the the only 'virtualization' you do is driven by /etc/[mail]/aliases. 
you must either insure those addresees are NOT taken up by a local delivery 
router/transport in the first instance, OR provide it with a place to drop 'em 
or the privs to create such on-the-fly if you DO allow it.

'The aliases file' BTW does not have to be the *system* aliases file, either.

Sometimes easier to manage if it is of the same structure, but otherwise 
separate.

HTH,

Bill


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