SendGrid를 사용하여 이메일 보내기

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// Define types
type EmailBody struct {
	Personalizations []EmailPersonalization `json:"personalizations"`
	From             EmailIdentifier        `json:"from"`
	Subject          string                 `json:"subject"`
	Content          []EmailContent         `json:"content"`
}

type EmailPersonalization struct {
	To            []EmailIdentifier `json:"to"`
	Substitutions map[string]string `json:"substitutions"`
}

type EmailIdentifier struct {
	Email string `json:"email"`
	Name  string `json:"name"`
}

type EmailContent struct {
	Type  string `json:"type"`
	Value string `json:"value"`
}

// Send an email
	emailBody := &EmailBody{
		Personalizations: []EmailPersonalization{
			{
				To: []EmailIdentifier{
					{
						Email: "tom@example.com",
						Name:  "Tom",
					},
				},
				Substitutions: map[string]string{
					"-name-": "Tom",
				},
			},
			{
				To: []EmailIdentifier{
					{
						Email: "sean@example.com",
						Name:  "Sean",
					},
				},
				Substitutions: map[string]string{
					"-name-": "Sean",
				},
			},
		},
		From: EmailIdentifier{
			Email: "no-reply@awesomegame.com",
			Name:  "Awesome Game",
		},
		Subject: "Login now to receive your Daily Login Reward!",
		Content: []EmailContent{
			{
				Type: "text/html",
				Value: `<p>
	Hello, -name-!<br />
	Login to Awesome Game now to receive your Daily Login Reward of 1000 Awesome Coins!
</p>`,
			},
		},
	}

	jsonBody, err := json.Marshal(emailBody)
	if err != nil {
		logger.Error("error marshaling email body", err)
		return err
	}

	request, err := http.NewRequest("post", "https://api.sendgrid.com/v3/mail/send", bytes.NewBuffer(jsonBody))
	request.Header.Set("Content-Type", "application/json")
	request.Header.Set("Authorization", "Bearer <YourSendgridApiKey>")

	client := &http.Client{}
	response, err := client.Do(request)
	defer response.Body.Close()

	if err != nil {
		logger.Error("error making HTTP post", err)
		return err
	}

	if response.StatusCode != 202 {
		logger.Warn("failed to send email", err)
	} else {
		logger.Info("successfully sent email")
	}