Why Does My PHP mail() Function Fail to Connect to localhost Port 25, and How Can I Fix It?

Resolve "Failed to connect to mailserver at "localhost" port 25" Error in PHP

When attempting to send email in PHP, you may encounter the frustrating error:

Failed to connect to mailserver at "localhost" port 25

This error indicates that the PHP mail() function is unable to establish a connection to the mail server running on your localhost. Despite configuring your php.ini file with the correct "SMTP" and "smtp_port" settings, you still experience this issue.

The solution lies in ensuring that you are running a local mail server.

For Unix System:

If your system runs Unix, you need to enable sendmail. Consult your Unix documentation for specific instructions.

For Windows System:

For Windows, you müssen die Komponente Simple Mail Transfer Server (SMTPS) von IIS installieren. Follow the steps outlined in the Microsoft documentation (http://msdn.microsoft.com/en-us/library/8b83ac7t.aspx) to successfully install SMTPS for Windows 2003 or a similar version of Windows.

Once you have set up and enabled a local mail server on your laptop, the PHP mail() function should now successfully send emails without the "Failed to connect to mailserver" error.

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