Yes. Once sections are created for your course, you can use the Announcements tool to send an email to specific sections by doing the following:

1. Add a new announcement, then select “Display to selected groups” (under the announcement entry field). If you haven't created any sections, this option will not appear.
2. Select the section(s) for which you would like to post an announcement.
3. If you would also like to have the announcement emailed to the members of the section(s) you have selected, select one of the options from the “Email Notification” drop-down box.
4. Click Add Announcement.

Note: You can also email specific sections using the Mailtool. Click the Mailtool and then click Select Sections at the top of the page. If you do not have the Mailtool in your lefthand toolbar, you can add it by going to Site info > Edit Tools.