docs: func (s *EmailContent) Validate() error {
  	invalidParams := request.ErrInvalidParams{Context: "EmailContent"}
  	if s.Raw != nil {
  		if err := s.Raw.Validate(); err != nil {
  			invalidParams.AddNested("Raw", err.(request.ErrInvalidParams))
  		}
  	}
  	if s.Simple != nil {
  		if err := s.Simple.Validate(); err != nil {
  			invalidParams.AddNested("Simple", err.(request.ErrInvalidParams))
  		}
  	}
  
  	if invalidParams.Len() > 0 {
  		return invalidParams
  	}
  	return nil
  }