- Release Notes
- Product Introduction
- Purchase Guide
- Getting Started
- Console Guide
- API Documentation
- SMTP Documentation
- Webhook Documentation
- Email Sending Restrictions
- FAQs
- Contact Us
- Release Notes
- Product Introduction
- Purchase Guide
- Getting Started
- Console Guide
- API Documentation
- SMTP Documentation
- Webhook Documentation
- Email Sending Restrictions
- FAQs
- Contact Us
The following sample code uses SMTP to send an email in Go language (v1.16):
package main
import (
"crypto/tls"
"fmt"
"log"
"net"
"net/smtp"
)
// Test465 for port 465
func Test465() error {
host := "sg-smtp.qcloudmail.com"
port := 465
// Sender address created in the console
email := "abc@cd.com"
// SMTP password set in the console
password := "****"
toEmail := "test@test123.com"
header := make(map[string]string)
header["From"] = "test " + "<" + email + ">"
header["To"] = toEmail
header["Subject"] = "test subject"
// HTML email
header["Content-Type"] = "text/html; charset=UTF-8"
body := "<!DOCTYPE html>\n<html>\n<head>\n<meta charset=\"utf-8\">\n<title>hello world</title>\n</head>\n<body>\n " +
"<h1>My first heading</h1>\n <p>My first paragraph.</p>\n</body>\n</html>"
// Plain text email
//header["Content-Type"] = "text/plain; charset=UTF-8"
//body := "test body"
message := ""
for k, v := range header {
message += fmt.Sprintf("%s: %s\r\n", k, v)
}
message += "\r\n" + body
auth := smtp.PlainAuth(
"",
email,
password,
host,
)
err := SendMailWithTLS(
fmt.Sprintf("%s:%d", host, port),
auth,
email,
[]string{toEmail},
[]byte(message),
)
if err != nil {
fmt.Println("Send email error:", err)
} else {
fmt.Println("Send mail success!")
}
return err
}
// Dial return a smtp client
func Dial(addr string) (*smtp.Client, error) {
conn, err := tls.Dial("tcp", addr, nil)
if err != nil {
log.Println("tls.Dial Error:", err)
return nil, err
}
host, _, _ := net.SplitHostPort(addr)
return smtp.NewClient(conn, host)
}
// SendMailWithTLS send email with tls
func SendMailWithTLS(addr string, auth smtp.Auth, from string,
to []string, msg []byte) (err error) {
//create smtp client
c, err := Dial(addr)
if err != nil {
log.Println("Create smtp client error:", err)
return err
}
defer c.Close()
if auth != nil {
if ok, _ := c.Extension("AUTH"); ok {
if err = c.Auth(auth); err != nil {
log.Println("Error during AUTH", err)
return err
}
}
}
if err = c.Mail(from); err != nil {
return err
}
for _, addr := range to {
if err = c.Rcpt(addr); err != nil {
return err
}
}
w, err := c.Data()
if err != nil {
return err
}
_, err = w.Write(msg)
if err != nil {
return err
}
err = w.Close()
if err != nil {
return err
}
return c.Quit()
}
func main() {
Test465()
}
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