mail/internal/mail/message.go
func (m *Message) SetAddressHeader(field, address, name string) {
	m.header[field] = []string{m.FormatAddress(address, name)}
}
func (m *Message) SetAddressHeader(field, address, name string) {
	m.header[field] = []string{m.FormatAddress(address, name)}
}
func ( m * Message ) SetAddressHeader ( field , address , name string ) { m . header [ field ] = [ ] string { m . FormatAddress ( address , name ) } }
// SetAddressHeader sets an address to the given header field.
SetAddressHeader sets an address to the given header field .