SMTP Connection Manager can be used to email using specific SMTP server. This connection manager support custom port and authentication using username/password features (Not found in native SSIS SMTP connection from Microsoft).
Once you finished above steps, Open Visual Studio and Create New SSIS Package Project.
Right click on Connection Managers Panel to Create New SMTP Connection for Server, and Context Menu will appear, Select New Connection from the Context Menu.
Select ZS-SMTP Connection Manager from the Connection Managers list and Click on Add Button.
Now in Connection Manager UI, enter SMTP Server name and unchecked on Anonymous Authentication. Enter correct User Name and Password and Test Email.
Click on Test Connection to check configure correct or not.
Click on OK to save SMTP Connection configure setting UI.
Once you finished, you will see SMTP connection in Connection Manager panel.