Hi @marcosmilani

It might be because your DigitalOcean account is fairly new, which means that sometimes there’s a filter activated to block SMTP to avoid spam on the platform.
You need to contact Support via the control panel to get unblocked.

Another solution I would recommend that you have a look at SparkPost as an alternative way of sending mails via WordPress.
https://www.sparkpost.com
https://wordpress.org/plugins/sparkpost/

Thank you very much for the real quick reply. I’ve managed to contact support guys (which also replied really quickly) and the problem is now solved =)

Same problem, unfortunately my smtp port is still blocked even though I messaged them.