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Hello,
I would recommend using SMTP to send out your emails. This would drastically improve the delivery rate of your emails and you would have the correct host in your email headers.
For example you could use Gmail’s SMTP service or setup your own on your droplet. If you decide to go with Gmail here’s a nice guide on how to configure and set that all up:
https://codeburst.io/sending-an-email-using-nodemailer-gmail-7cfa0712a799
Hope that this helps! Regards, Bobby