I have a customer who runs a mail server at their organization, and they want email to their domain delivered to that server.
So I created an MX record with a high priority and of course that works, *except* :
It seems that when mail is sent from an account hosted on the same server (say from some other domain we're hosting) to the domain in question, the system always attempts to deliver it locally first. Since no email addresses actually exist in this domain on our server, it of course bounces. Here's an interesting part: the sender receives a bounce message but the mail does eventually reach the customer's mail server and is delivered.
Ok, so one solution is to use a catchall for the domain and use a pop3 connector on their local mail server to download messages from it periodically. This would result in a bit of a delay when messages are sent to this domain from other accounts on our server, which isn't the end of the world. However, they are running Exchange 5.5 which does not have a freely available pop3 downloader.
So what I'm asking is, is there any way to configure qmail to not attempt local delivery first? Or perhaps tell it to route all mail to this domain to a different server?
This is only a problem when somebody on our same server is trying to send mail to this domain, but in this case it is actually a problem because many of our customers are business partners.