can't send email error in log appear
Darn, that makes debugging difficult. I guess I'll file a bug with the errors that stopped the digest send.
After further testing this problem appears to be related to the nodebb-plugin-amazons3 plugin. After I disabled it I was able to upload a user profile picture.
For sendmail, on our own servers, we run the following commands:
echo "PATH=/usr/sbin:$PATH" >> ~/.profile
echo "127.0.0.1 localhost localhost.localdomain $INSTANCE_ID" >> /etc/hosts
You can see the reasoning behind the latter here: https://brianhogg.com/how-to-fix-slow-sendmail-on-a-digital-ocean-ubuntu-droplet/
@Absam-Sibsam you saved me bro, worked perfectly!