nefkho
is it possible to host domainx.com.ph from provider1 and domainy.com from provider2 that will be hosted in SME 7.3?
You can host as many domains as you want on your sme server, the provider has nothing to do with it.
Setup your main domain first, and then add more domains in the Domains panel.
You need to change external DNS records for each domain (that may be setup with different external hosts) so they all point to your sme servers external IP address.