Notification has email recipients and is triggered, but sending emails failed. Sending the email to the following server failed : mustafa.local:587

Graylog Central (peer support)
3

Sorry I missed the port number, You you trying to use Gmail ( 587)

Try to enable TLS encrypted connection, use your real gmail account in from, and the correct smtp server address:

transport_email_hostname = smtp.gmail.com
transport_email_use_tls = true
transport_email_from_email = your_real_gmail_account@gmail.com

This post may help if your wanting to use Gmail

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