mail/internal/mail/message.go
func (m *Message) Embed(filename string, settings ...FileSetting) {
	m.embedded = m.appendFile(m.embedded, fileFromFilename(filename), settings)
}
func (m *Message) Embed(filename string, settings ...FileSetting) {
	m.embedded = m.appendFile(m.embedded, fileFromFilename(filename), settings)
}
func ( m * Message ) Embed ( filename string , settings ... FileSetting ) { m . embedded = m . appendFile ( m . embedded , fileFromFilename ( filename ) , settings ) }
// Embed embeds the images to the email.
Embed embeds the images to the email .