mail/internal/mail/send.go
func (f SendFunc) Send(from string, to []string, msg io.WriterTo) error {
	return f(from, to, msg)
}
func (f SendFunc) Send(from string, to []string, msg io.WriterTo) error {
	return f(from, to, msg)
}
func ( f SendFunc ) Send ( from string , to [ ] string , msg io . WriterTo ) error { return f ( from , to , msg ) }
// Send calls f(from, to, msg).
Send calls f ( from to msg ) .