For future reference based on this article.
For incoming connections: a) specify the domain as being secure (i.e. requires TLS) via something like this –
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Set-TransportConfig -TLSReceiveDomainSecureList woodgrovebank.com |
Do the above on the Mailbox server. You can force a sync to edge after that via Start-EdgeSynchronization on the Mailbox server.
Then b) on the Edge server enable domain secured and TLS (they are likely to be already enabled by default).
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Set-ReceiveConnector Internet -DomainSecureEnabled $true -AuthMechanism TLS |