Exchange 2016 Secure Email Relay

Hello all, could you please provide some guidance on common best practices for configuring secure email relay?  What port number should be used, TLS, certificates, authentication, etc.  Thanks.
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secure relay is relay where you configure only specific server IPs to send out (relay) emails through your server
Normally as long as your server is not acting as open relay, relay can be said secure, its different part that when you configure relay most of the security checks on email is relaxed but only for those hosts which are on relay allowed list (trusted devices)
Relay needs SMTP 25 port

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Todd NelsonSystems EngineerCommented:
Alternately to the recommendation by Mahesh, would be to ensure the "relay" connector requires authentication on port 587 (TLS), and use an SSL certificate from a public CA.
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