The procedure to eliminate the sendmail error in version 8.0.1 is:
Open cmd.exe as Administrator on commandserver.
Execute the following commands.
net stop NovaStorDCCommandServer
cd C:\Program Files\NovaStor\DataCenter\tomee\webapps\dc-ejb\WEB-INF\lib
del geronimo-javamail_1.4_mail-1.9.0-alpha-2.jar
net start NovaStorDCCommandServer
The behaviour is caused by a packaging problem which will be solved in the next release.