Why is my PHP mail() function\'s \'From\' header incorrect, and how can I fix it?

Troubleshooting PHP Mail 'From' Header Discrepancy

When sending emails with PHP's mail() function, it is essential to ensure that the sender's address is accurately reflected in the email headers. In this instance, the user is facing a problem where the 'From' header remains as the web host's email address, while the 'Reply-To' header is set to the desired value.

The root of the issue lies in the attempt to use a Gmail address as the 'From' value. Many ISPs, including Gmail, have strict anti-spoofing measures that prevent emails from being sent with a 'From' address that does not match the originating server. In such cases, the ISP will overwrite the 'From' address with the actual server address.

Workaround using the '-f' Parameter

To resolve this issue, the user can utilize the fifth parameter of the mail() function, which allows specifying an additional 'From' header. By adding the parameter "-f [email protected]", the user can instruct the server to send the email with the specified 'From' address, even if it differs from the originating server.

This workaround is effective with many ISPs and allows the user to maintain consistency between the sender's address in the 'From' and 'Reply-To' headers.

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