Exchange 2016 relaying

[goose]

Hi,

I have a Fortimail appliance that currently relays mail for my Lotus servers.

I have built two new Exchange servers as part of a migration project.

On these Exchange servers I have configured a Send connect to point to the Fortimail IP and the scoping is *.mySMTPdomain.com

On the Fortimail on the Access Control tab I have added my two Exchange servers.

Now I can telnet on port 25 from my Exchange to Fortimail.

But I cant send mail from Exchange externally, after a time I get the following bounce back message - returned '550 4.4.7 QUEUE.Expired; message expired in unreachable destination queue. Reason: A matching connector cannot be found to route the external recipient'

Any ideas ??

[Bromont_FTNT]

See anything in the logs on the Fortimail? (History or Mail event logs) then does a PCAP on the Fortimail show the connections from the Exchange servers?

[goose]

Nothing in the history logs.

The mail event logs only show mail in from my external address to the company. 

Am I missing a setting on the Fortimail ? 

Can Fortimail accept mail from two different mail platforms at the same time ?

[goose]

under domain & user -> domain

I have my smtp domain name and the SMTP server is one of the Lotus servers, do I need to replicate this for each of my Exchange servers with their IP's ?