Seconding this update to the docs when possible. I spent 1-2 days just to discover this as Digital Ocean has now blocked sending with SMTP. The workaround with port 2525 is working but not sure for how long. My suggestion is to please mention this somewhere in the docs that it could be caused by Digital Ocean’s blocking as I have 5 separate websites running on ghost hosted by digital ocean that I now need to reconfigure.
Thank you.