Why is my PHP mail() function failing with 'Failed to connect to mailserver at 'localhost' port 25'?

Troubleshooting "Failed to Connect to Mailserver at 'localhost' Port 25" Error

When utilizing PHP's mail() function to transmit emails, users frequently encounter the following error:

Warning: mail() [function.mail]: Failed to connect to mailserver at "localhost" port 25, verify your "SMTP" and "smtp_port" setting in php.ini or use ini_set()

To resolve this issue, you must ensure that a mail server is running locally.

Unix Environments:

• Enable sendmail.

Windows Environments:

• Install the Simple Mail Transfer Server (SMTP) component of IIS.

For Windows 2003:

• Follow these steps provided by Microsoft: https://msdn.microsoft.com/en-us/library/8b83ac7t.aspx

Once you have confirmed that a mail server is running on your local machine, you should restart your PHP application and attempt to send an email again. If the problem persists, verify that the SMTP and smtp_port settings in your php.ini file are correctly configured.

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