Error in Sending Email Task using connector Id "mail-send"

For anyone interested in getting it working for a Linux service:
I simply added the line:

Environment='MAIL_CONFIG=/opt/tomcat/conf/mail-config.properties'

to my /etc/systemd/system/tomcat.service.
Before that my MAIL_CONFIG was always null.

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Hi,
has anybody seen following exception?

05-Sep-2019 14:15:25.932 WARNUNG [http-nio-8080-exec-3] org.camunda.bpm.engine.rest.exception.ExceptionHandler.toResponse java.lang.IllegalStateException: Unable to load mail configuration from: here is the correct path

at java.lang.Thread.run(Unknown Source)
Caused by: java.io.FileNotFoundException: here is the correct path (Zugriff verweigert)
at java.io.FileInputStream.open0(Native Method)

The environment variable MAIL_CONFIG is defined and pointing to the mail-config.properties file located in tomcat conf directory.