Every domain will have its own smtp address. If your friend has got a domain name domainname.com then his SMTP address is domainname.com or mail.domainname.com
You keep in mind that you configure his DNS properly or else the SMTP wouldn't work with the domain name. You can utilize IP of your VPS Hosting for pop3 but for smtp you will require a configured domain name residing on your VPS Hosting.
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