New mail subdomain versus existing domain issues

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New mail subdomain versus existing domain issues
I'm setting up a new server with the goal of using letsencrypt ‎versus my self signed cert. (I'm also going to try those SpamAssassin alternatives that require less RAM.) So I will run two VPS for a period as I debug the new server.

That said, is there any way to implement email going to both and That is I intend the email servers to be different. Seems to me maybe Dovecot won't mind but I don't see this working with postfix. 

Or should I just register a new top level domain for testing? 

While I'm at it, is it suggested that email and Web use different certificates.