Re: [cobalt-users] Errors sending mail to external mail server

[flash22@xxxxxxx]

On Tue, 13 Feb 2001, Matt Syracuse wrote:

> Hi all,
> On a RAQ3, when we setup sites that use their own email server (e.g., MS
> Exchange, etc) where there's a DNS "A record" that points to the customer's
> mail server, the customer receives mail ok. But when WE send mail through
> the RAQ3 to that customer, it comes back as rejected; "Server Respone:'550
> <username@xxxxxxxxxxx>...User unknown"
> 
> Only if we send the message using the format "username@xxxxxxxxxxxxxxxx",
> where smtp.website.com is the "A record" that points to the customer's
> Exchange server.  Again, this only applies to the sender if they are sending
> through the same Cobalt RAQ that the site sits on.
> 
> Is this a feature, bug or incorrect configuration?

Do you also have MX domain.com ->smtp.domain.com ?
Does the remote server know that one of it's aliases is @domain.com?