1. Navigate to your Blackboard course site, and at the lower left click Course Tools > Student Email Addresses.
2. Click "Spreadsheet" to download a CSV file containing all of your students' email addresses. Or click "HTML Table" to view the email addresses in a table within your browser.
The best way to copy all of your student email addresses at once is to use the "Spreadsheet" option, open the downloaded file in Microsoft Excel, select all of the cells containing the email addresses at once and then copy and paste.