What are potential pitfalls when filtering out Bouncemails based on Betreffzeilen like "failure" or "Returned mail" in PHP?

When filtering out Bouncemails based on Betreffzeilen like "failure" or "Returned mail" in PHP, potential pitfalls include false positives where legitimate emails are mistakenly classified as bounce emails due to similar subject lines. To mitigate this issue, it is important to carefully consider the keywords used for filtering and possibly combine them with other criteria such as the email address or bounce error code. 

// Example code snippet to filter out bounce emails based on Betreffzeilen
$subject = $email->getSubject();

// Check if the subject contains keywords indicating a bounce email
if (strpos(strtolower($subject), 'failure') !== false || strpos(strtolower($subject), 'returned mail') !== false) {
    // Additional checks can be added here to further validate if the email is indeed a bounce email
    // Process the bounce email accordingly
} else {
    // Process regular emails
}

Keywords

filtering Bouncemails Betreffzeilen failure Returned mail

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