func (m *Message) Inline(file string) error {
	return m.attach(file, true)
}
func (m *Message) Inline(file string) error {
	return m.attach(file, true)
}
func ( m * Message ) Inline ( file string ) error { return m . attach ( file , true ) }
// Inline includes a file as an inline attachment.
Inline includes a file as an inline attachment .