chore: validate email addresses with dns

utils/dns.go

@@ -0,0 +1,16 @@
+package utils
+
+import (
+	"net"
+	"strings"
+)
+
+// CheckEmailMX takes an e-mail address and verifies that an MX DNS record exists for its domain
+func CheckEmailMX(email string) bool {
+	parts := strings.Split(email, "@")
+	if len(parts) != 2 {
+		return false
+	}
+	records, err := net.LookupMX(parts[1])
+	return len(records) > 0 && err == nil
+}