What potential pitfalls should be considered when using third-party form mailer services with PHP?

One potential pitfall when using third-party form mailer services with PHP is the security risk of exposing sensitive information, such as API keys or email credentials, in the code. To mitigate this risk, it is recommended to store sensitive information in environment variables and use a secure method to access them in the code. 

// Retrieve sensitive information from environment variables
$api_key = getenv('API_KEY');
$email_password = getenv('EMAIL_PASSWORD');

// Use the retrieved information in the code
// Example:
// $client = new ThirdPartyService($api_key);
// $client->sendEmail($email_password, $recipient, $subject, $message);

Keywords

security vulnerabilities data privacy cross-site scripting form validation spam filtering

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