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Bloody DigitalOcean not say and and Bloody DigitalOcean interface not NOTICE that sendmail is always blocked, and you need to get permission with support agent. ;-)
SOLUTION!
The SMTP ports are blocked to avoid spam according to DO, the solution I found at least in wordpress is to create a free account ZOHOMAIL and then do all the DNS records configuration,
then I installed the WP SMTP plugin in Wordpress
https://cl.wordpress.org/plugins/wp-smtp/
I entered the SMTP configuration for Zoho Mail - SSL
https://www.zoho.com /es-xl/mail/help/zoho-smtp.html
, I ran a test and solved!
All Wordpress one-click droplets have Postfix, a mail server/MTA, installed. You can verify that it’s running by looking at the output of:
sudo ps wwaux | grep postfix | grep -v grep
Try running the following command on your droplet:
nc -z smtp.gmail.com 25
If it does not output the following, it’s possible that SMTP is blocked on your droplet. In that case, please file a support ticket and the support team will take care of it. Thanks!
Connection to smtp.gmail.com port 25 [tcp/smtp] succeeded!