ESP32-使用SMTP SERVER發送電子郵件(mail)教學－凶王的部落

請先到以下網址將你要寄信的gmail帳戶修改安全權限,不然將無法透過應用程式的方式來寄信
https://myaccount.google.com/lesssecureapps?pli=1

不同的SMTP SERVER可能會有不同的設定方式,這邊以GMAIL為範例

下面是OUTLOOK及GMAIL的SMTP的設置,如果需要可以參考看看

完成前面的步驟之後,請將下面的程式碼燒錄到ESP32或ESP8266上

功能很簡單,一上電或是重啟之後,ESP會連到你指定的熱點,一旦連到就會執行寄信的動作

請注意程式碼中備註的地方除了功能說明外還須依照你的熱點,密碼及MAIL....等等需要修改才能使用

程式碼:

//請先到以下網址將你要寄信的mail帳戶修改安全權限,不然將無法使用
//https://myaccount.google.com/lesssecureapps?pli=1
#include <Arduino.h>
#if defined(ESP32)
#include <WiFi.h>
#elif defined(ESP8266)
#include <ESP8266WiFi.h>
#endif
#include <ESP_Mail_Client.h>

#define WIFI_SSID "XXXXX"//輸入熱點
#define WIFI_PASSWORD "XXXXXXX"//輸入熱點密碼

#define SMTP_HOST "smtp.gmail.com"//這邊用GOOGLE
#define SMTP_PORT 465 //google是465如果寄信的帳戶不是google要另外查

/* The sign in credentials */
#define AUTHOR_EMAIL "XXXXXXXXX@gmail.com"//寄件者MAIL
#define AUTHOR_PASSWORD "XXXXXXXX"//寄件者密碼

/* Recipient's email*/
#define RECIPIENT_EMAIL "XXXXXXXXX@gmail.com"//收件者MAIL

/* The SMTP Session object used for Email sending */
SMTPSession smtp;

/* Callback function to get the Email sending status */
void smtpCallback(SMTP_Status status);

void setup(){
Serial.begin(115200);
Serial.println();
Serial.print("Connecting to AP");
WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
while (WiFi.status() != WL_CONNECTED){
Serial.print(".");
delay(200);
}
Serial.println("");
Serial.println("WiFi connected.");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
Serial.println();

/** Enable the debug via Serial port
* none debug or 0
* basic debug or 1
*/
smtp.debug(1);

/* Set the callback function to get the sending results */
smtp.callback(smtpCallback);

/* Declare the session config data */
ESP_Mail_Session session;

/* Set the session config */
session.server.host_name = SMTP_HOST;
session.server.port = SMTP_PORT;
session.login.email = AUTHOR_EMAIL;
session.login.password = AUTHOR_PASSWORD;
session.login.user_domain = "";

/* Declare the message class */
SMTP_Message message;

/* Set the message headers */
message.sender.name = "ESP32";//寄件者名稱
message.sender.email = AUTHOR_EMAIL;//寄件者帳戶
message.subject = "ESP Test Email";//寄信主旨
message.addRecipient("Felix", RECIPIENT_EMAIL);//收件者名稱跟他的MAIL

/*Send HTML message*/
/*
String htmlMsg = "<div style=\"color:#2f4468;\"><h1>Hello World!</h1><p>- Sent from ESP board</p></div>";
message.html.content = htmlMsg.c_str();
message.html.content = htmlMsg.c_str();
message.text.charSet = "us-ascii";
message.html.transfer_encoding = Content_Transfer_Encoding::enc_7bit;
*/

//Send raw text message
String textMsg = "Hello World! - Sent from ESP board 12/10";//信件內容
message.text.content = textMsg.c_str();
message.text.charSet = "us-ascii";
message.text.transfer_encoding = Content_Transfer_Encoding::enc_7bit;

message.priority = esp_mail_smtp_priority::esp_mail_smtp_priority_low;
message.response.notify = esp_mail_smtp_notify_success | esp_mail_smtp_notify_failure | esp_mail_smtp_notify_delay;

/* Set the custom message header */
//message.addHeader("Message-ID: <abcde.fghij@gmail.com>");

/* Connect to server with the session config */
if (!smtp.connect(&session))
return;

/* Start sending Email and close the session */
if (!MailClient.sendMail(&smtp, &message))
Serial.println("Error sending Email, " + smtp.errorReason());
}

void loop(){

}

/* Callback function to get the Email sending status */
void smtpCallback(SMTP_Status status){
/* Print the current status */
Serial.println(status.info());

/* Print the sending result */
if (status.success()){
Serial.println("----------------");
ESP_MAIL_PRINTF("Message sent success: %d\n", status.completedCount());
ESP_MAIL_PRINTF("Message sent failled: %d\n", status.failedCount());
Serial.println("----------------\n");
struct tm dt;

for (size_t i = 0; i < smtp.sendingResult.size(); i++){
/* Get the result item */
SMTP_Result result = smtp.sendingResult.getItem(i);
time_t ts = (time_t)result.timestamp;
localtime_r(&ts, &dt);

ESP_MAIL_PRINTF("Message No: %d\n", i + 1);
ESP_MAIL_PRINTF("Status: %s\n", result.completed ? "success" : "failed");
ESP_MAIL_PRINTF("Date/Time: %d/%d/%d %d:%d:%d\n", dt.tm_year + 1900, dt.tm_mon + 1, dt.tm_mday, dt.tm_hour, dt.tm_min, dt.tm_sec);
ESP_MAIL_PRINTF("Recipient: %s\n", result.recipients);
ESP_MAIL_PRINTF("Subject: %s\n", result.subject);
}
Serial.println("----------------\n");
}
}

成功之後你會看到如下

如果成功監控視窗會反饋以下畫面