I recently discovered droplet hasn’t been sending out emails from a Contact Us page on my Wordpress website. I confirmed outgoing port 25 wasn’t blocked by the firewall, so submitted a ticket to Support. Here was their response:
I am sorry to hear that you are facing issue with the SMTP on the Droplet. It looks like you trying to use Floating IP address for the SMTP. In order to curb abuse, sending mail through SMTP is not supported with Floating IPs. You can use the static Droplet IP address for the SMTP.
Is there a single command I can run on my Ubuntu 18.04 server to only route my outgoing port 25 traffic through my static IP?
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