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Hello @infoSeal,
I would recommend trying to use port 587 with tls rather than 25 and see if this works.
If not, what I could suggest is making sure that port 587 is open for outgoing TCP connections via your firewall.
If this still does not work, I could suggest connecting to your Droplet via SSH and testing if you can connect on port 587 with telnet:
telnet portquiz.net 587
Let me know how it goes! Regards, Bobby