I am using grails 3.0.5
after I try to install the plugin ... I find out .. how is it ..
compile "org.grails.plugins:mail:2.0.0.RC2" ==> this plugin from grails.org compile 'org.apache.activemq:activemq-spring:5.11.1' ==> this plugin from activemq.apache.org compile "com.sun.mail:javax.mail:1.5.1" ==> this plugin look like from oracle
therefore, not all plugins must include org.grails.plugins
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