Email Server: Virtual domains and SSL requirements for encrypted SMTP

  • Thread starter Thread starter Supmethods
  • Start date Start date
S

Supmethods

Hi all

I'm setting up an email server which has multiple virtual domains.

What I'd like to know is the requirements for encrypted SMTP.

If I setup the DNS like this:
example.com MX 10 mail.example.com
example2.com MX 10 mail.example2.com
test.com MX 10 mail.test.com

Does this mean I'll need a valid certificate for both domains. i.e. two separate certificates or SAN certificate?

Alternatively, if set up the MX as follows would it make a difference:
example.com MX 10 mail.example.com
example2.com MX 10 mail.example.com
test.com MX 10 mail.example.com

If I set the MX for all domain to mail.example.com, will I just require a SSL certificate that's valid for mail.example.com?

Thank you in advance.

Sophal

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