As mentioned by previous posts, we we`re referring to ~1300 emails per month, that you can send for free, after that you have to pay according to mailguns flex tier pricing.
Sorry for the confusion
Back to your question.
Can you set up your droplet to act as your mail server?
Will it be easy?
The problem isn’t sending the mail per se.
It’s getting the mail to your customers inbox in a timely and safe manner, that is the problem.
Most people tend to forget that without TSL, SPF and DKIM, properly set up, you’re mails are going to get flagged by your customers mailprovider and get deleted or at least moved to spam.
Nobody wants that. That’s why mail providers exist in the first place. They keep their servers of of any blacklists and follow proper encryption and protocol standards.
Anyway, i would start out with mailgun, if i were you. And if you notice, that the 3000 emails per month for the first 3 Months aren’t enough you could still move to another provider.
There are also big firms like aws or google cloud, that offer alot of solutions for mail delivery. Google Cloud for example gives you a 300$ credit to use on any service they have, so that might be something for you aswell, later on.
But feel free to ask if you have any further questions