By default, email addresses in GauchoSpace are hidden from other participants. This has the effect of giving messages sent via GauchoSpace a <no-reply> email address (both Instructor Announcements and Peachmail).
To change this so that students are able to reply to your messages in their email, you need to update your email preferences in your profile:
1. Log in to GauchoSpace.
2. On your Dashboard page, in the UCSB Course Overview block, click edit my profile.

3. Scroll to Privacy. In the Email display field, select Allow only other course members to see my email address.
4. Scroll to the bottom and click Update profile.
5. Now students may reply to your messages from their personal email. These replies will be sent directly to your email address.
By default, students can email their instructors and TAs directly using the peachmail block. The block looks like this for students:

In the settings for the peachmail block, Instructors can disable the Email Instructor/TA feature and also have the option of adding a "Email all" option, which allows students to send a message that CCs all instructors and TAs in the course.