send

type ErrorResponse struct {
	Errors []struct {
		Message string      `json:"message"`
		Field   interface{} `json:"field"`
		Help    interface{} `json:"help"`
	} `json:"errors"`
}

type PostRequest struct {
	Personalizations []struct {
		To []struct {
			Email string `json:"email"`
			Name  string `json:"name"`
		} `json:"to"`
		Cc []struct {
			Email string `json:"email"`
			Name  string `json:"name"`
		} `json:"cc"`
		Bcc []struct {
			Email string `json:"email"`
			Name  string `json:"name"`
		} `json:"bcc"`
		Substitutions map[string]string `json:"substitutions"`
	} `json:"personalizations" validate:"required"`
	From struct {
		Email string `json:"email" validate:"required"`
		Name  string `json:"name"`
	} `json:"from"`
	ReplyTo struct {
		Email string `json:"email"`
		Name  string `json:"name"`
	} `json:"reply_to"`
	Subject string `json:"subject" validate:"required"`
	Content []struct {
		Type  string `json:"type"`
		Value string `json:"value"`
	} `json:"content" validate:"required"`
	Attachments []struct {
		Content     string `json:"content"`
		Type        string `json:"type"`
		Filename    string `json:"filename"`
		Disposition string `json:"disposition"`
		ContentId   string `json:"content_id"`
	} `json:"attachments"`
}