Long of the short, my company was recently bought out. We set up an SSL tunnel between us and our parent company for ease of access and yesterday I setup a Conditional Forward in our DNS so we can resolve FQDN's on their side.
Last night, my Exchange server bounced a message saying delivery is delayed on an email I sent to someone at the parent company. My guess is because my Exchange is trying to resolve the MX using their DNS servers because of the conditional forward for their domain.
They're using Exchange Online for email hosting, so there's no server across the SSL tunnel to hit, and no MX record within their own DNS for their own servers.
Any idea how I might resolve this?
Can I do a 2nd conditional forward for the MX sending it to the Internet for resolution? I know I can't setup a zone as well as having the conditional. Not sure where to go with this.