graylog itself works. Only the alert-mail does not work. If i add an email recipient and try to send an test notification i get the message: Error: Notification has email recipients and is triggered, but sending emails failed. null
The same thing if i try it with an local user who has an email (User recipient)
When i start a sniffer on the firewall i see no communication via port 587. i have already entered the ip instead of the dns name in GRAYLOG_TRANSPORT_EMAIL_HOSTNAME. Also without success.
Additionally:
I have already tried deactivating the e-mail authentication to check whether packets are sent to the firewall in this way.
But nothing arrived here either.
I found out the following:
If i run the docker-image with version: graylog/graylog:4.2, mail alert works fine with same configuration.
If i upgrade the version from 4.2 to 4.3 i get this error-message in alert mail section:
Loading component failed: Loading chunk 57e33c6c-61 failed. (missing: http://:9000/assets/57e33c6c-61.11b9f72925818240e61d.js)
if i upgrade from 4.2 to 4.3.0 to 4.3.1 mail altert is working. so i must start with latest 4.2 and then upgrade step by step to get mail alert working.