Mutual TLS for domain security of Exchange 2007 provides a relatively low cost alternative to S/MIME and other message-level security solutions.
A trusted certificate authority must be in place. Both company A and B must trust the CA.
Partner Send connector only has Ms-Exch-Send-Headers-Routing permission. Follow my blog Exchange 2007:TLS and the following:
Domain A:
Assuming the toPartnerB send connector is created;
Set-SendConnector toPartnerB -DomainSecureEnabled:$true
Domain B: partner
Set-TransportConfig -TLSReceiveDomainSecureList DomainA.com
Set-ReceiveConnector 'Default B' -DomainSecureEnabled:$true -AuthMechanism TLS.
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I didn't complete the LAB. It seems straight-forward and I don't think it worths my time to do lab, as long as I know it only implements the encryption security among two domains' transport servers.
