Reply on "Send Message" email not going anywhere

We haven't subscribed to Recruiting Booster. We are using Send Message action to send messages to candidates and it use recruiter name as the display name and oracle email address (standard url). since it has a display name as recruiter candidates are getting confused and replying to that email because since we are not subscribed to Recruiting Booster and 2-way communication is not enabled, replies are going no-where.

How are you managing these?

Thank you!