fix and test email parsing, add mock matrix

config/config.go

@@ -16,6 +16,7 @@ type Config struct {
 	Client   string
 	Message  struct {
 		Matrix struct {
+			Mock       bool
 			Homeserver string
 			Username   string
 			Token      string

config/duration.go

@@ -11,7 +11,7 @@ func (d Duration) Get() time.Duration {
 	return time.Duration(d)
 }
 
-func (d *Duration) MarshalJSON() ([]byte, error) {
+func (d Duration) MarshalJSON() ([]byte, error) {
 	return json.Marshal(d.Get().String())
 }