What potential pitfalls should be considered when using external libraries like Swift Mailer for email functionality in PHP?

Potential pitfalls when using external libraries like Swift Mailer for email functionality in PHP include security vulnerabilities, compatibility issues with other libraries or frameworks, and performance overhead. To mitigate these risks, it is important to regularly update the library to the latest version, thoroughly test the integration with your application, and monitor performance impact. 

// Example of updating Swift Mailer library to the latest version
composer require "swiftmailer/swiftmailer:^6.0"

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Swift Mailer external libraries email functionality PHP potential pitfalls

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