Default email port changed from 25 to 587
Realised no email was getting sent from my NodeBB after an update to 1.12.1
Checking the logs it was trying to connect to localhost on port 587. However by default exim4 only listens on port 25, so NodeBB must have changed this (or the default plugin nodebb uses for sending email).
I couldn't see this documented anywhere but it may affect other users so mentioning it here.
On Debian I changed
Might be worth mentioning this somewhere if it's not already been done.