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Hello,
It would not matter where your emails are hosted at as long as your A record is pointing to your Digital Ocean droplet’s IP address.
My guess would be that you either made a change to the A record and now the domain name is not pointing to the droplet, or that you changed your nameservers.
You could use this website here to check your current Nameservers:
Just enter your domain name and choose NS from the drop down. If you see the Microsoft Nameservers, then this means that your DNS zone is now managed through Microsoft and you need to go there and add an A record for your domain name to point to the droplet’s IP, and a CNAME record for your www version to point to your domain name itself.
If the Nameservers are still set to the Digital Ocean ones, then you need to check your current A record and make sure that it matches your droplet’s IP.
Hope that this helps, let me know if you need any help!
Regards, Bobby