how to set up a mail server on my ubuntu droplet

hello support: I am in a transition of moving my web applications from another web hosting service to digital ocean. They updated my DNS to map my site to the new ip address. But it seems that I need to set up a mail server before they can route it too, as quoted

A record changes will affected the MX record as it is the CNAME of which is pointed to server’s IP address. If A record is changed to another IP address, mail server will be changed to the same IP address too. … Please let us know if you also want to routed an email service to another provider.

so my understanding is that I need to install mail server on my ubuntu droplet before I give them a go-ahead, is it correct? Then is there a tutorial about how to set up a mail server?

thanks a lot, jon

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I recommend qmail for a basic mail server: It includes delivery to a file, forwards and an SMTP server with access control. It should take one about an hour to install via Life With Qmail. Although I have heard great things about Postfix, I have not used it extensively. You should probably avoid using sendmail. Qmail does have a sendmail workalike.