diff --git a/handlers.go b/handlers.go
index 1615d0e..7f3f8a4 100644
--- a/handlers.go
+++ b/handlers.go
@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"net/http"
 	"os"
+	"strings"
 )
 
 // RegistrationRequest represents the incoming registration request.
@@ -78,3 +79,24 @@ func registerHandler(w http.ResponseWriter, r *http.Request) {
 		"message": "User registered successfully. Please check your email to set your password.",
 	})
 }
+
+func validateEmailDomain(email string) bool {
+	allowedDomains := os.Getenv("ALLOWED_DOMAINS")
+	if allowedDomains == "" {
+		return false
+	}
+
+	parts := strings.Split(email, "@")
+	if len(parts) != 2 {
+		return false // Invalid email format
+	}
+
+	domain := parts[1]
+	allowed := strings.Split(allowedDomains, ",")
+	for _, allowedDomain := range allowed {
+		if strings.TrimSpace(domain) == strings.TrimSpace(allowedDomain) {
+			return true
+		}
+	}
+	return false
+}