The Gmail connector allows you to access the Gmail REST API through WSO2 ESB and send an Email . Gmail is a free, Web-based e-mail service provided by Google. First download the Gmail Connector from WSO2 store . And Start the WSO2 ESB server using below steps. download the ESB runtime ZIP file , and then extract the ZIP file. The path to this folder will be referred to as <ESB_HOME> throughout the post. Navigate to the <PRODUCT_HOME>/bin/ directory using the Command Prompt. To start the server in a typical environment: On Windows: wso2server.bat --run On Linux/Mac OS: sh wso2server.sh To start the server in the background mode of Linux: sh wso2server.sh start To stop the server running in this mode, you will enter: sh wso2server.sh stop now go to https://localhost:9443/carbon and log into the management console using username admin...