When I was working on a project before, I made a function to send emails using phpmailer, "CI Framework Combined with PHPmailer to Send Emails". It was launched yesterday (I just started using Sina Cloud, but it was too expensive, so I switched to Alibaba). When testing, I accidentally reported an error when sending an email...
I wiped it, and it worked fine when I was not online. It succeeded every time. At first I thought it was There was a problem with the smtp address (I used 163 mailbox) and later changed it to QQ mailbox. I found that it still didn't work. I had no choice but to ask Du Niang. Later, after looking at the answers on Baidu, I realized that in addition to Google's smtp server receiving the request "smtp" will be accepted. Other servers are like the 163 I use. QQ and other servers must receive uppercase "smtp" requests... emmmmm....
Then in class.phpmailer.php I put
public function IsSMTP() { $this->Mailer = 'smtp'; } //改成 public function IsSMTP() { $this->Mailer = 'SMTP'; }
and then:
switch($this->Mailer) { case 'sendmail': return $this->SendmailSend($header, $body); case 'smtp': return $this->SmtpSend($header, $body); default: return $this->MailSend($header, $body); } //改成 switch($this->Mailer) { case 'sendmail': return $this->SendmailSend($header, $body); case 'SMTP': return $this->SmtpSend($header, $body); default: return $this->MailSend($header, $body); }
I originally thought this would be enough. I restarted Apache and tested it again. As a result, the first error was solved, and another error appeared:
Could not instantiate mail function
? ? ? ? ?
I don’t know if you guys showed up. I had bad luck, so I had to ask Du Niang again, and finally found the reason: some virtual hosts or servers blocked the "fsockopen() function" for security reasons, resulting in the inability to send emails. .
The following is the solution:
First, remove the following two semicolons in php.ini
;extension=php_sockets.dll
;extension=php_openssl.dll
I had already removed it when I used PHPmailer before, here is just a reminder.
Then replace the fsockopen function
Replace the fsockopen function in the class.smtp.php file with the pfsockopen function:
$this->smtp_conn = @fsockopen($host, // the host of the server $port, // the port to use $errno, // error number if any $errstr, // error message if any $tval); // give up after ? secs //fsockopen改为: $this->smtp_conn = @pfsockopen($host, // the host of the server $port, // the port to use $errno, // error number if any $errstr, // error message if any $tval); // give up after ? secs
After setting this up, I can successfully send emails. If you also have this problem, you can try it by referring to the above example.
The above is the detailed content of Solution to SMTP Error when sending emails using phpmailer. For more information, please follow other related articles on the PHP Chinese website!

The main advantages of using database storage sessions include persistence, scalability, and security. 1. Persistence: Even if the server restarts, the session data can remain unchanged. 2. Scalability: Applicable to distributed systems, ensuring that session data is synchronized between multiple servers. 3. Security: The database provides encrypted storage to protect sensitive information.

Implementing custom session processing in PHP can be done by implementing the SessionHandlerInterface interface. The specific steps include: 1) Creating a class that implements SessionHandlerInterface, such as CustomSessionHandler; 2) Rewriting methods in the interface (such as open, close, read, write, destroy, gc) to define the life cycle and storage method of session data; 3) Register a custom session processor in a PHP script and start the session. This allows data to be stored in media such as MySQL and Redis to improve performance, security and scalability.

SessionID is a mechanism used in web applications to track user session status. 1. It is a randomly generated string used to maintain user's identity information during multiple interactions between the user and the server. 2. The server generates and sends it to the client through cookies or URL parameters to help identify and associate these requests in multiple requests of the user. 3. Generation usually uses random algorithms to ensure uniqueness and unpredictability. 4. In actual development, in-memory databases such as Redis can be used to store session data to improve performance and security.

Managing sessions in stateless environments such as APIs can be achieved by using JWT or cookies. 1. JWT is suitable for statelessness and scalability, but it is large in size when it comes to big data. 2.Cookies are more traditional and easy to implement, but they need to be configured with caution to ensure security.

To protect the application from session-related XSS attacks, the following measures are required: 1. Set the HttpOnly and Secure flags to protect the session cookies. 2. Export codes for all user inputs. 3. Implement content security policy (CSP) to limit script sources. Through these policies, session-related XSS attacks can be effectively protected and user data can be ensured.

Methods to optimize PHP session performance include: 1. Delay session start, 2. Use database to store sessions, 3. Compress session data, 4. Manage session life cycle, and 5. Implement session sharing. These strategies can significantly improve the efficiency of applications in high concurrency environments.

Thesession.gc_maxlifetimesettinginPHPdeterminesthelifespanofsessiondata,setinseconds.1)It'sconfiguredinphp.iniorviaini_set().2)Abalanceisneededtoavoidperformanceissuesandunexpectedlogouts.3)PHP'sgarbagecollectionisprobabilistic,influencedbygc_probabi

In PHP, you can use the session_name() function to configure the session name. The specific steps are as follows: 1. Use the session_name() function to set the session name, such as session_name("my_session"). 2. After setting the session name, call session_start() to start the session. Configuring session names can avoid session data conflicts between multiple applications and enhance security, but pay attention to the uniqueness, security, length and setting timing of session names.


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Dreamweaver CS6
Visual web development tools

WebStorm Mac version
Useful JavaScript development tools

ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment

SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.

SublimeText3 Mac version
God-level code editing software (SublimeText3)