Can I use IPv6 port 25 outgoing on DigitalOcean? Cody Selzer September 04, 2020 01:30 Updated Follow Question Can I use IPv6 port 25 outgoing on DigitalOcean? Answer No, IPv6 connections outgoing on port 25 are blocked network-wide. More details here: https://ideas.digitalocean.com/ideas/DO-I-1366 Related articles cPanel DNS Cluster Guide Why is port 25 blocked? Why is my Time To First Byte high? How to encode (punycode) internationalized domain names to add to cPanel How do I change my Exim SMTP port from 25? Comments 0 comments Article is closed for comments.