Setting up Exchange 2013 email relay-receive connectors

I have setup several devices on our internal network to use our internal Exchange Server to relay emails and it works fine. I ran into something last night when I added a new all-in-one printer that has scan to email. This department has a different domain for their emails than is configured on our internal domain. I do not host their Exchange Server. I would still like to be able to forward their emails for them.

Example our domain is mydomain.com and their domain is theirdomain.com.

When the sender email address is configured as user@theirdomain.com the emails do not relay off of our Exchange Server.

How can I configure the Exchange Server so I can have them have theirdomain.com as their domain for emails?
Just to clarify they are users on our internal domain but their email domain is different than our internal domain and a third party hosts their email server for them.
bankadminAsked:
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Manikandan NarayanswamySecurity Specialist & IBM Security GuardiumCommented:
Hi,

For relaying emails to other domain you have to create a relay connector now while defining the connector either you can use the DNS MX records to relay email or you can use a Smart host. Refer the below link for the same.

http://exchangeserverpro.com/exchange-2013-configure-smtp-relay-connector/

Thanks
Manikandan
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bankadminAuthor Commented:
I don't necessarily want to connect exchange servers I'm not trying to accept emails from another server to mine. I'm not sure if my explanation was clear so here is some more information. I can send a email from this device when the senders email address is from our domain, I can send that email anywhere outside or inside our network. When I change the senders email address to a different domain I cant send a email from the device.
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