Marek Miklewicz
32 lines
1012 B
PHP
32 lines
1012 B
PHP
<?php
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declare(strict_types=1);
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final class MessageClassifier
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{
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/** @param array<string,string> $headers */
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public static function shouldSuppress(array $headers, string $sender): bool
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{
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$sender = strtolower(trim($sender));
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if ($sender === '' || str_starts_with($sender, 'mailer-daemon') || str_starts_with($sender, 'postmaster')) {
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return true;
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}
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$normalized = [];
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foreach ($headers as $key => $value) {
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$normalized[strtolower(trim($key))] = strtolower(trim($value));
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}
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if (($normalized['auto-submitted'] ?? 'no') !== 'no') {
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return true;
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}
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if (in_array($normalized['precedence'] ?? '', ['bulk', 'list', 'junk'], true)) {
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return true;
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}
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if (($normalized['list-id'] ?? '') !== '') {
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return true;
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}
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if (str_contains($normalized['content-type'] ?? '', 'delivery-status')) {
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return true;
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}
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return false;
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}
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}
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