func (m *Message) FormatDate(date time.Time) string {
	return date.Format(time.RFC1123Z)
}
func (m *Message) FormatDate(date time.Time) string {
	return date.Format(time.RFC1123Z)
}
func ( m * Message ) FormatDate ( date time . Time ) string { return date . Format ( time . RFC1123Z ) }
// FormatDate formats a date as a valid RFC 5322 date.
FormatDate formats a date as a valid RFC 5322 date .