Can i build an email server without domain name ?

I have a digitalocean account ,and digitalocean gave me a vps_ip,i hava no domain name to use. Can i build an email server without domain name ,just with my vps_ip? How to make the task done?

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This question was answered by @CrypticDesigns:

Thats possible, but all mails you send will go to spam. Google is your big friend…

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