[CentOS] Forcing TLS for SMTP?

Wed Dec 4 22:03:10 UTC 2019
Lists <lists at benjamindsmith.com>

I have a goal of securing email. Updated the company mail server and DNS 
(CentOS 7 + Postfix, otherwise pretty stock) with support for SPF, DKIM, and 
DMARC. So far, all good, and everything "just works". 

Our mail server has supported SMTP / TLS for a long time, but recently I've 
been considering requring TLS all the time. 

Is there anybody here who's done this? Has it caused any particular fallout? 
I'm curious about: 

1) Requiring SMTP / TLS for any inbound email. 

2) Requiring SMTP / TLS for any outbound email. 

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