We recently setup SBS 2003 for one of our clients. They had decided to keep their email at their current hosting company so we are using the POP3 Connector to download it into their Exchange mailboxes. They have 2 offices in different parts of the country and there is only one side using Exchange, the other side use POP directly from the email provider.
When a user who is using the Exchange server tries to send to someone who is not using the Exchange server they get the 5.1.1 error due to the fact that they are not in the Exchange organization which is natural. I currently have the Recipent policy set so that the mail knows how to get back, firstname.lastname@example.org, which is causing the 5.1.1 error. The question is how I can get around this and still have the users being able to mail out and also receive it fine.
Any help is much appreciated.