deleteAll.php

<?php

# composer require aws/aws-sdk-php
use Aws\SesV2\SesV2Client;

require 'vendor/autoload.php';

define('AWS_ACCESS_KEY_ID', '');
define('AWS_SECRET_ACCESS_KEY', '');
$client = new SesV2Client([
    'version'     => 'latest',
    'region'      => 'eu-west-2',
    'credentials' => [
        'key'    => AWS_ACCESS_KEY_ID,
        'secret' => AWS_SECRET_ACCESS_KEY,
    ],
]);

$list = $client->listSuppressedDestinations()->get('SuppressedDestinationSummaries');
echo sprintf('There are %s emails to remove'.PHP_EOL, \count($list));

foreach ($list as $emailListed) {
    echo 'Deleting Email: '.$emailListed['EmailAddress'].PHP_EOL;
    $res = $client->deleteSuppressedDestination([
        'EmailAddress' => $emailListed['EmailAddress'],
    ]);
}