Difference between -TlsDomain and -DomainSecureEnabled Parameters for Sendconnectors

Hi Exchange-Community,

I just came across with the different possibilties for securing mail flow between Partner companies.

I'm a little confused by the difference between -TlsDomain and -DomainSecureEnabled. All Whitepapers and tutorials for secured Partner communication refer only to the -DomainSecureEnabled Parameter. (With conjunction of Set-transportConfig -tlssenddomainsecurelist etc. of course)

Can anybody enlight me when I have to use the -TlsDomain Parameter, and what it finally does? 

Thanks for any response

Chris