Hello The emails don’t sending using SMTP. Looks like the ports are closed. Please open ports for emails (probably 587 and 465 ports) Thanks
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Contact DO support - there is a chance that outbound mail traffic is blocked on your account:
https://cloudsupport.digitalocean.com/s/createticket
This is something you would need to do one your account. If you are using software like UFW open the ports there, or if you are using the DO firewall you can do so via your account control panel.
Here is a great article on DO Cloud Firewalls
https://www.digitalocean.com/community/tutorials/an-introduction-to-digitalocean-cloud-firewalls