[BlueOnyx:14496] Re: Mail delivery failing as "user unknown"

[Chris Gebhardt - VIRTBIZ Internet]

On 2/7/2014 4:59 PM, Chris Gebhardt - VIRTBIZ Internet wrote:
> This has cropped up in the past day.   We have a customer with a
> dedicated server who reports email bouncing for no particular reason.
> I have looked into it for the customer, and the server is bouncing the
> email as "No such user here".   The problem is the user very much exists
> and can be found in the GUI as well as virtusertable.
>
> I noticed /var/log/maillog throwing this:
>    alias database /etc/mail/aliases.db out of date
>
> So I gave a "newaliases" and that went away.
>
> For good measure I have done
>    makemap hash /etc/mail/virtusertable.db < /etc/mail/virtusertable
>
> and then restart Sendmail, but we're still getting the same problem.   I
> even did a make clean / make in /etc/mail and then Sendmail restart and
> still no joy.
>
> Suggestions are welcome.
>

FWIW, it was suggested that this had something to do with the customer's 
(ill-advised) use of CNAME on their MX.  That does not appear to be the 
case.

It would be great if someone has a suggestion on this.
-- 
Chris Gebhardt
VIRTBIZ Internet Services
Access, Web Hosting, Colocation, Dedicated
www.virtbiz.com | toll-free (866) 4 VIRTBIZ