Email gets encoded in plain text email

Unbuffered code for conditionals etc <% code %>
Escapes html by default with <%= code %>
Unescaped buffering with <%- code %>

src/mail_templates/welcome_user.ejs

@@ -8,7 +8,7 @@ Follow the link to get started.
 <%= setupLink %>
 
 <% if (invitor && invitor.email) { %>
-You are receiving this email because you were invited by <%= invitor.email %>.
+You are receiving this email because you were invited by <%- invitor.email %>.
 <% } %>