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Hi @macewindu,
Firstly, I would assume you are hosting it on your droplet and not using the app from the browser, correct?
If yes, please make sure you have your port 587 actually allowed to output connections. You can directly enable it from your droplet using IPTABLES:
sudo iptables -A OUTPUT -p tcp --sport 587 -m conntrack --ctstate ESTABLISHED -j ACCEPT
sudo iptables -A OUTPUT -p tcp --dport 587 -m conntrack --ctstate NEW,ESTABLISHED -j ACCEPT
Regards, KFSys