EXIM email setup to external hosting

hi,

I have a vps server with multiple sites. I have setup the mail and for the site that has mailboxes created on ajenti it works fine.

However i have another website and the mailbox is hosted by the vps provider (ovh). when sending emails i get the following error in the exim logs:

exim -bt info@domain.com
R: vforward for info@domain.com
info@domain.com is undeliverable: Unrouteable address
<-- info@domain.com

can someone guide me on how to send emails that dont have local mailboxes to the outside servers?

thank you