With the continuous development of the Internet, email has become one of the important communication tools in people's daily work and life. In network development, we often need to use code to send emails to users or other systems for notifications, reminders, etc. This article will introduce how to use PHP language to send emails through SMTP protocol and TLS encryption.

1. Introduction to SMTP protocol

The full name of SMTP is (Simple Mail Transfer Protocol). It is a network protocol used for email transmission. It specifies how to send emails. and reception methods and mail transfer rules between servers.

When using the SMTP protocol to send emails, you need to use the address, port, user name, password and other information of the SMTP server. The address of the SMTP server is generally provided by the email provider, and the port number is generally 25. If you need to send emails encrypted, you need to use the SSL encryption or TLS encryption method of the SMTP server.

2. Introduction to TLS encryption method

The full name of TLS is Transport Layer Security (Transport Layer Security). It is a commonly used encrypted communication protocol used to protect the security of network communications.

When sending emails using TLS encryption, the SMTP server will send the encryption certificate to the client. After the client passes the verification, it will use public key encryption to send the email information to the SMTP server.

3. Preparations for sending emails using PHP

When using PHP to send emails, you need to prepare the following information:

1. The address and port of the SMTP server No.
2. Sender’s email address and password
3. Recipient’s email address, email subject and content, etc.

4. Steps to send emails using PHP

After preparing the above information, we can complete the sending of emails through PHP code. The following are the specific steps to use PHP to send emails:

1. Set SMTP server information

In PHP, you can use the 'PHPMailer' class to implement SMTP protocol and TLS encryption email sending. First, you need to set the SMTP server address, port number, TLS encryption method and other information. The code is as follows:

$mail = new PHPMailer();
$mail->isSMTP();
$mail->SMTPDebug = 2;                                 
$mail->SMTPAuth = true;                              
$mail->SMTPSecure = 'tls';                           
$mail->Host = 'smtp.gmail.com';  
$mail->Port = 587;                                    

In these codes, we use the SMTP server address as 'smtp.gmail.com' and the port number. is 587, and the SMTPSecure parameter is set to 'tls', indicating that TLS encryption is used to send emails.

2. Set the sender information

   Next, you need to set the sender’s email address and password. The code is as follows:

$mail->Username = 'youremail@gmail.com'; 
$mail->Password = 'yourpassword';   
$mail->setFrom('youremail@gmail.com', 'Your Name');

3. Set recipient information

Next, you need to set the recipient, subject, body and other information of the email. The code is as follows:

$mail->addAddress('recipient1@example.com', 'Recipient Name');
$mail->addAddress('recipient2@example.com');
$mail->addReplyTo('info@example.com', 'Information');
$mail->addCC('cc@example.com');
$mail->addBCC('bcc@example.com');
$mail->Subject = 'The Paper Airplane Contest';
$mail->Body    = 'Dear Recipient, <br><br> Are you ready for the upcoming paper airplane contest?';
$mail->AltBody = 'Dear Recipient, Are you ready for the upcoming paper airplane contest?';

In these codes , we used the addAddress() function to add the recipient address, the setFrom() function to set the sender address, and the addCC() and addBCC() functions to set the CC and BCC addresses.

4. Send an email

Finally, you need to use the send() function to send an email. The complete code is as follows:

$mail = new PHPMailer();
$mail->isSMTP();
$mail->SMTPDebug = 2;                                 
$mail->SMTPAuth = true;                              
$mail->SMTPSecure = 'tls';                           
$mail->Host = 'smtp.gmail.com';  
$mail->Port = 587;                                    
$mail->Username = 'youremail@gmail.com'; 
$mail->Password = 'yourpassword';   
$mail->setFrom('youremail@gmail.com', 'Your Name');
$mail->addAddress('recipient1@example.com', 'Recipient Name');
$mail->addAddress('recipient2@example.com');
$mail->addReplyTo('info@example.com', 'Information');
$mail->addCC('cc@example.com');
$mail->addBCC('bcc@example.com');
$mail->Subject = 'The Paper Airplane Contest';
$mail->Body    = 'Dear Recipient, <br><br> Are you ready for the upcoming paper airplane contest?';
$mail->AltBody = 'Dear Recipient, Are you ready for the upcoming paper airplane contest?';
if(!$mail->send()) {
    echo 'Message could not be sent.';
    echo 'Mailer Error: ' . $mail->ErrorInfo;
} else {
    echo 'Message has been sent';
}

5. Summary

This article introduces how to use PHP language to send emails through SMTP protocol and TLS encryption. When using this method to send emails, you need to prepare the address and port number of the SMTP server, the sender's email address and password, the recipient's email address, email subject and content, etc., and set this information through PHP code Finally, use the send() function to send the email.

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