mox!

smtp/addrlit.go

@@ -0,0 +1,16 @@
+package smtp
+
+import (
+	"net"
+)
+
+// AddressLiteral returns an IPv4 or IPv6 address literal for use in SMTP.
+func AddressLiteral(ip net.IP) string {
+	// ../rfc/5321:2309
+	s := "["
+	if ip.To4() == nil {
+		s += "IPv6:"
+	}
+	s += ip.String() + "]"
+	return s
+}