Using Let's Encrypt SSL for website and mail

I have an active SSL cert for "" that is hosted on Server1. If I have a mail service that is hosted on Server2 and uses the same domain root, "", would I be able to use the same cert? Or do I need to buy a second SSL for the same domain on the mail server?

>Solution :

  1. Your certificate’s SAN (Subject Alternative Name) should either contain both of the target domains or a wildcard domain like *
  2. Additionally, the private key must be copied from server 1 to server 2.

If you follow the suggestions above, you should be good to go.

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