I am trying to migrate a sendmail mail server into the Postfix/Zimbra world.

I have a client's company that requires TLS to speak with its mail servers. In sendmail, we enabled TLS and also added to /etc/mail/access (hashed to access.db)

TLS_rcpt:<other-domain>.com PERM+128

How do I do this with Zimbra and Post Fix?

Thanks!