I am using Graylog4 in a docker container via docker compose
I tried testing an email alert and received the error.
The Graylog server encountered an error while trying to send an email. This is the detailed error message: java.lang.NullPointerException
The docker compose Example 2 at Docker makes reference to.
GRAYLOG_TRANSPORT_FROM_EMAIL
This should be:
GRAYLOG_TRANSPORT_EMAIL_FROM_EMAIL