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SMTP在Windows上无法使用mail函数发邮件，请剔除这个模块 #25459
Description
Description
The following code:
//SMTP在Windows上无法使用mail函数发邮件，请剔除这个模块
<?phpResulted in this output:
But I expected this output instead:
PHP Version
PHP 8.6.0RC7 (cli) (built: Nov 11 2026 23:42:49) (ZTS Visual C++ 2026 x64)
Copyright © The PHP Group and Contributors
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Zend Engine v4.6.0RC7, Copyright © Zend by Perforce
with Zend OPcache v8.6.0RC7, Copyright ©, by Zend by Perforce
Operating System
Win11
Activity
devnexen commentedon Nov 14, 2026
So I asked chatgpt to help on this :)
The issue template was left empty, so there is no reproducer or error message to look at.
On Windows, mail() uses a minimal built-in SMTP client: it does not support SMTP authentication or TLS (STARTTLS / SMTPS). Most mail providers require both, so mail() can only deliver through a relay that accepts unauthenticated connections (for example a local MTA on localhost:25). This is a known limitation rather than a bug.
For sending through a provider, please use a library such as PHPMailer or Symfony Mailer, which support authentication and encryption.
Removing mail() on Windows would be a backward compatibility break and would need to go through the RFC process (https://wiki.php.net/rfc/howto), so it can't be handled as a bug report. Closing for now. If you get a specific warning from mail() against a server that does not require authentication, feel free to reopen with the exact message and your SMTP/smtp_port/sendmail_from settings.
谢谢反馈。Windows 上的 mail() 使用内置的简易 SMTP 客户端，不支持 SMTP 认证和 TLS 加密，因此无法直接通过需要认证的邮件服务商发送邮件。这是已知限制，不是 bug。建议使用 PHPMailer 或 Symfony Mailer。移除该功能属于不兼容变更，需要走 RFC 流程。
hu-weicheng commentedon Nov 15, 2026
我知道了，感谢恢复！