Why Am I Getting a \'Multiple or Malformed Newlines Found in additional_header\' Error in PHP\'s mail() Function?

Multiple Newlines Error in PHP mail() Function

Users have encountered an error while using PHP's mail() function, receiving the message: "Multiple or malformed newlines found in additional_header."

Cause

This error was triggered by a recent update to PHP version 5.5.26. A security vulnerability was addressed, disallowing multiple or malformed newlines in additional_header arguments. This prevents malicious actors from injecting additional messages through headers.

Solution

To resolve this error, follow these steps:

• Sanitize Headers: Ensure that your additional_header parameters do not contain multiple newlines. Invalid combinations include rr, r

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