PHP Tutorials - Herong's Tutorial Examples - v5.17, by Herong Yang
Use SMTPS Protocol with PHPMailer
This section provides a tutorial example on how to send remote emails with PHPMailer using STMPS (SMTP Secure) protocol.
If your remote email server uses STMPS protocol, you need to add more settings on the PHPMailer instance.
For example, your remote email service provider gives you the following access information:
Host Name: smtp.example.com Port: 587 Protocol: SMTPS (Use TLS/SSL) Authentication: Password User Name: herong@herongyang.com Password: TopScret
Then you can use the following PHP script to send out emails.
<?php # PHPMailer-Send-Email-SMTPS.php #- Copyright 2019 (c) HerongYang.com. All Rights Reserved. use PHPMailer\PHPMailer\PHPMailer; use PHPMailer\PHPMailer\SMTP; use PHPMailer\PHPMailer\Exception; $srcDir = "/home/herong/local/php/vendor/phpmailer/phpmailer/src/"; require "$srcDir/PHPMailer.php"; require "$srcDir/SMTP.php"; require "$srcDir/Exception.php"; $mail = new PHPMailer(true); $mail->SMTPDebug = 4; $mail->isSMTP(); $mail->SMTPAuth = true; $mail->SMTPSecure = 'TLS'; $mail->Host = "smtp.example.com"; $mail->Port = 587; $mail->Username = 'herong@herongyang.com'; $mail->Password = 'TopScret'; try { $mail->setFrom('herong@herongyang.com', 'Herong Yang'); $mail->addAddress('joe@herongyang.com', 'Joe Doe'); $mail->Subject = 'PHPMailer Test - SMTPS Protocol'; $mail->Body = 'There is a test message from PHPMailer.'; $mail->send(); } catch (Exception $e) { # PHPMailer exceptions echo $e->errorMessage(); } catch (\Exception $e) { # PHP exceptions echo $e->getMessage(); } ?>
If you run the above PHP script, you should these debugging messages:
heronng$ php PHPMailer-Send-Email-SMTPS.php ... Connection: opening to smtp.herongyang.com:587, timeout=300 ... Connection: opened ... SMTP INBOUND: "220 smtp.herongyang.com" ... SERVER -> CLIENT: 220 smtp.herongyang.com ... CLIENT -> SERVER: EHLO localhost ... SMTP INBOUND: "250-smtp.herongyang.com" ... SMTP INBOUND: "250-PIPELINING" ... SMTP INBOUND: "250-SIZE 73400320" ... SMTP INBOUND: "250-STARTTLS" ... SMTP INBOUND: "250-AUTH LOGIN PLAIN" ... SMTP INBOUND: "250-AUTH=LOGIN" ... SMTP INBOUND: "250-MAILCOMPRESS" ... SMTP INBOUND: "250 8BITMIME" ... CLIENT -> SERVER: STARTTLS ... SMTP INBOUND: "220 Ready to start TLS" ... SERVER -> CLIENT: 220 Ready to start TLS ... Auth method requested: UNSPECIFIED ... Auth methods available on the server: LOGIN,PLAIN ... Requested auth method not available: ... Auth method selected: LOGIN ... CLIENT -> SERVER: AUTH LOGIN ... SMTP INBOUND: "334 ..." ... SMTP INBOUND: "235 Authentication successful" ... SERVER -> CLIENT: 235 Authentication successful ... CLIENT -> SERVER: MAIL FROM:<herong.yang@herongyang.com> ... SMTP INBOUND: "250 Ok" ... SERVER -> CLIENT: 250 Ok ... CLIENT -> SERVER: RCPT TO:<herong.yang@herongyang.com> ... SMTP INBOUND: "250 Ok" ... SERVER -> CLIENT: 250 Ok ... CLIENT -> SERVER: DATA ... SMTP INBOUND: "354 End data with <CR><LF>.<CR><LF>" ... SERVER -> CLIENT: 354 End data with <CR><LF>.<CR><LF> ... ... CLIENT -> SERVER: . ... SMTP INBOUND: "250 Ok: queued as" ... SERVER -> CLIENT: 250 Ok: queued as ... CLIENT -> SERVER: QUIT ... SMTP INBOUND: "221 Bye" ... SERVER -> CLIENT: 221 Bye ... Connection: closed
Sometimes, you may get the following error message. The error message suggests that the certificate from the remote host failed to pass the validation. It might be using a self-signed certificate, which should be imported manually imported to your local computer.
... Connection: opening to somehost.com:587, timeout=300, options=array() ... Connection: opened ... SMTP INBOUND: "220 somehost.com ESMTP Postfix" ... SERVER -> CLIENT: 220 somehost.com ESMTP Postfix ... CLIENT -> SERVER: EHLO local.herongyang.com ... SMTP INBOUND: "250-somehost.com" ... ... CLIENT -> SERVER: STARTTLS ... SMTP INBOUND: "220 2.0.0 Ready to start TLS" ... SERVER -> CLIENT: 220 2.0.0 Ready to start TLS ... Connection failed. Error #2: stream_socket_enable_crypto(): SSL operation failed with code 1. OpenSSL Error messages: rror:14090086:SSL routines: SSL3_GET_SERVER_CERTIFICATE: certificate verify failed... ... SMTP Error: Could not connect to SMTP host. ... CLIENT -> SERVER: QUIT ... SMTP INBOUND: "...??????\4O... ... SERVER -> CLIENT: ????B??dU??S9Ly... ... SMTP ERROR: QUIT command failed: ????B??dU??S9Ly... ... Connection: closed ... SMTP Error: Could not connect to SMTP host.
Table of Contents
Introduction and Installation of PHP
PHP Data Types and Data Literals
Variables, References, and Constants
Expressions, Operations and Type Conversions
Conditional Statements - "if" and "switch"
Loop Statements - "while", "for", and "do ... while"
Function Declaration, Arguments, and Return Values
Interface with Operating System
Introduction of Class and Object
Integrating PHP with Apache Web Server
Retrieving Information from HTTP Requests
Creating and Managing Sessions in PHP Scripts
Sending and Receiving Cookies in PHP Scripts
Controlling HTTP Response Header Lines in PHP Scripts
MySQL Server Connection and Access Functions
Functions to Manage Directories, Files and Images
SOAP Extension Function and Calling Web Services
SOAP Server Functions and Examples
Localization Overview of Web Applications
Using Non-ASCII Characters in HTML Documents
Using Non-ASCII Characters as PHP Script String Literals
Receiving Non-ASCII Characters from Input Forms
"mbstring" Extension and Non-ASCII Encoding Management
Managing Non-ASCII Character Strings with MySQL Servers
Parsing and Managing HTML Documents
►Configuring and Sending Out Emails
Using Local Windows System as a Mail Server
Sending Out Emails from PHP Scripts
Sending Out Emails on Linux Systems
Install PHPMailer on CentOS Systems
Send Local Emails with PHPMailer
Send Remote Emails with PHPMailer
►Use SMTPS Protocol with PHPMailer
Install PHPMailer from Source Code
Managing PHP Engine and Modules on macOS