diff --git a/src/Symfony/Component/Mailer/Bridge/Amazon/CHANGELOG.md b/src/Symfony/Component/Mailer/Bridge/Amazon/CHANGELOG.md
index 67a52bd9460ba..3d889f297d90d 100644
--- a/src/Symfony/Component/Mailer/Bridge/Amazon/CHANGELOG.md
+++ b/src/Symfony/Component/Mailer/Bridge/Amazon/CHANGELOG.md
@@ -1,6 +1,12 @@
 CHANGELOG
 =========
 
+6.0
+---
+
+ * Remove the `SesApiTransport` class, use `SesApiAsyncAwsTransport` instead
+ * Remove the `SesHttpTransport` class, use `SesHttpAsyncAwsTransport` instead
+
 5.3
 ---
 
diff --git a/src/Symfony/Component/Mailer/Bridge/Amazon/Tests/Transport/SesApiTransportTest.php b/src/Symfony/Component/Mailer/Bridge/Amazon/Tests/Transport/SesApiTransportTest.php
deleted file mode 100644
index 2df22ed67c644..0000000000000
--- a/src/Symfony/Component/Mailer/Bridge/Amazon/Tests/Transport/SesApiTransportTest.php
+++ /dev/null
@@ -1,176 +0,0 @@
-<?php
-
-/*
- * This file is part of the Symfony package.
- *
- * (c) Fabien Potencier <fabien@symfony.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Symfony\Component\Mailer\Bridge\Amazon\Tests\Transport;
-
-use PHPUnit\Framework\TestCase;
-use Symfony\Component\HttpClient\MockHttpClient;
-use Symfony\Component\HttpClient\Response\MockResponse;
-use Symfony\Component\Mailer\Bridge\Amazon\Transport\SesApiTransport;
-use Symfony\Component\Mailer\Exception\HttpTransportException;
-use Symfony\Component\Mime\Address;
-use Symfony\Component\Mime\Email;
-use Symfony\Contracts\HttpClient\ResponseInterface;
-
-/**
- * @group legacy
- */
-class SesApiTransportTest extends TestCase
-{
-    /**
-     * @dataProvider getTransportData
-     */
-    public function testToString(SesApiTransport $transport, string $expected)
-    {
-        $this->assertSame($expected, (string) $transport);
-    }
-
-    public function getTransportData()
-    {
-        return [
-            [
-                new SesApiTransport('ACCESS_KEY', 'SECRET_KEY'),
-                'ses+api://ACCESS_KEY@email.eu-west-1.amazonaws.com',
-            ],
-            [
-                new SesApiTransport('ACCESS_KEY', 'SECRET_KEY', 'us-east-1'),
-                'ses+api://ACCESS_KEY@email.us-east-1.amazonaws.com',
-            ],
-            [
-                (new SesApiTransport('ACCESS_KEY', 'SECRET_KEY'))->setHost('example.com'),
-                'ses+api://ACCESS_KEY@example.com',
-            ],
-            [
-                (new SesApiTransport('ACCESS_KEY', 'SECRET_KEY'))->setHost('example.com')->setPort(99),
-                'ses+api://ACCESS_KEY@example.com:99',
-            ],
-        ];
-    }
-
-    public function testSend()
-    {
-        $client = new MockHttpClient(function (string $method, string $url, array $options): ResponseInterface {
-            $this->assertSame('POST', $method);
-            $this->assertSame('https://email.eu-west-1.amazonaws.com:8984/', $url);
-            $this->assertStringContainsStringIgnoringCase('X-Amzn-Authorization: AWS3-HTTPS AWSAccessKeyId=ACCESS_KEY,Algorithm=HmacSHA256,Signature=', $options['headers'][0] ?? $options['request_headers'][0]);
-
-            parse_str($options['body'], $content);
-
-            $this->assertSame('Hello!', $content['Message_Subject_Data']);
-            $this->assertSame('"Saif Eddin" <saif.gmati@symfony.com>', $content['Destination_ToAddresses_member'][0]);
-            $this->assertSame('=?UTF-8?B?SsOpcsOpbXk=?= <jeremy@derusse.com>', $content['Destination_CcAddresses_member'][0]);
-            $this->assertSame('"Fabien" <fabpot@symfony.com>', $content['Source']);
-            $this->assertSame('Hello There!', $content['Message_Body_Text_Data']);
-            $this->assertSame('aws-configuration-set-name', $content['ConfigurationSetName']);
-            $this->assertSame('aws-source-arn', $content['FromEmailAddressIdentityArn']);
-
-            $xml = '<SendEmailResponse xmlns="https://email.amazonaws.com/doc/2010-03-31/">
-  <SendEmailResult>
-    <MessageId>foobar</MessageId>
-  </SendEmailResult>
-</SendEmailResponse>';
-
-            return new MockResponse($xml, [
-                'http_code' => 200,
-            ]);
-        });
-        $transport = new SesApiTransport('ACCESS_KEY', 'SECRET_KEY', null, $client);
-        $transport->setPort(8984);
-
-        $mail = new Email();
-        $mail->subject('Hello!')
-            ->to(new Address('saif.gmati@symfony.com', 'Saif Eddin'))
-            ->cc(new Address('jeremy@derusse.com', 'Jérémy'))
-            ->from(new Address('fabpot@symfony.com', 'Fabien'))
-            ->text('Hello There!');
-
-        $mail->getHeaders()->addTextHeader('X-SES-CONFIGURATION-SET', 'aws-configuration-set-name');
-        $mail->getHeaders()->addTextHeader('X-SES-SOURCE-ARN', 'aws-source-arn');
-
-        $message = $transport->send($mail);
-
-        $this->assertSame('foobar', $message->getMessageId());
-    }
-
-    public function testSendWithAttachments()
-    {
-        $client = new MockHttpClient(function (string $method, string $url, array $options): ResponseInterface {
-            $this->assertSame('POST', $method);
-            $this->assertSame('https://email.eu-west-1.amazonaws.com:8984/', $url);
-            $this->assertStringContainsStringIgnoringCase('X-Amzn-Authorization: AWS3-HTTPS AWSAccessKeyId=ACCESS_KEY,Algorithm=HmacSHA256,Signature=', $options['headers'][0] ?? $options['request_headers'][0]);
-
-            parse_str($options['body'], $body);
-            $content = base64_decode($body['RawMessage_Data']);
-
-            $this->assertStringContainsString('Hello!', $content);
-            $this->assertStringContainsString('Saif Eddin <saif.gmati@symfony.com>', $content);
-            $this->assertStringContainsString('Fabien <fabpot@symfony.com>', $content);
-            $this->assertStringContainsString('Hello There!', $content);
-            $this->assertStringContainsString(base64_encode('attached data'), $content);
-
-            $this->assertSame('aws-configuration-set-name', $body['ConfigurationSetName']);
-
-            $xml = '<SendEmailResponse xmlns="https://email.amazonaws.com/doc/2010-03-31/">
-  <SendRawEmailResult>
-    <MessageId>foobar</MessageId>
-  </SendRawEmailResult>
-</SendEmailResponse>';
-
-            return new MockResponse($xml, [
-                'http_code' => 200,
-            ]);
-        });
-        $transport = new SesApiTransport('ACCESS_KEY', 'SECRET_KEY', null, $client);
-        $transport->setPort(8984);
-
-        $mail = new Email();
-        $mail->subject('Hello!')
-             ->to(new Address('saif.gmati@symfony.com', 'Saif Eddin'))
-             ->from(new Address('fabpot@symfony.com', 'Fabien'))
-             ->text('Hello There!')
-             ->attach('attached data');
-
-        $mail->getHeaders()->addTextHeader('X-SES-CONFIGURATION-SET', 'aws-configuration-set-name');
-        $mail->getHeaders()->addTextHeader('X-SES-SOURCE-ARN', 'aws-source-arn');
-
-        $message = $transport->send($mail);
-
-        $this->assertSame('foobar', $message->getMessageId());
-    }
-
-    public function testSendThrowsForErrorResponse()
-    {
-        $client = new MockHttpClient(function (string $method, string $url, array $options): ResponseInterface {
-            $xml = "<SendEmailResponse xmlns=\"https://email.amazonaws.com/doc/2010-03-31/\">
-                <Error>
-                    <Message>i'm a teapot</Message>
-                    <Code>418</Code>
-                </Error>
-            </SendEmailResponse>";
-
-            return new MockResponse($xml, [
-                'http_code' => 418,
-            ]);
-        });
-        $transport = new SesApiTransport('ACCESS_KEY', 'SECRET_KEY', null, $client);
-        $transport->setPort(8984);
-
-        $mail = new Email();
-        $mail->subject('Hello!')
-            ->to(new Address('saif.gmati@symfony.com', 'Saif Eddin'))
-            ->from(new Address('fabpot@symfony.com', 'Fabien'))
-            ->text('Hello There!');
-
-        $this->expectException(HttpTransportException::class);
-        $this->expectExceptionMessage('Unable to send an email: i\'m a teapot (code 418).');
-        $transport->send($mail);
-    }
-}
diff --git a/src/Symfony/Component/Mailer/Bridge/Amazon/Tests/Transport/SesHttpTransportTest.php b/src/Symfony/Component/Mailer/Bridge/Amazon/Tests/Transport/SesHttpTransportTest.php
deleted file mode 100644
index bd5babdadd0e3..0000000000000
--- a/src/Symfony/Component/Mailer/Bridge/Amazon/Tests/Transport/SesHttpTransportTest.php
+++ /dev/null
@@ -1,136 +0,0 @@
-<?php
-
-/*
- * This file is part of the Symfony package.
- *
- * (c) Fabien Potencier <fabien@symfony.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Symfony\Component\Mailer\Bridge\Amazon\Tests\Transport;
-
-use PHPUnit\Framework\TestCase;
-use Symfony\Component\HttpClient\MockHttpClient;
-use Symfony\Component\HttpClient\Response\MockResponse;
-use Symfony\Component\Mailer\Bridge\Amazon\Transport\SesHttpTransport;
-use Symfony\Component\Mailer\Exception\HttpTransportException;
-use Symfony\Component\Mime\Address;
-use Symfony\Component\Mime\Email;
-use Symfony\Contracts\HttpClient\ResponseInterface;
-
-/**
- * @group legacy
- */
-class SesHttpTransportTest extends TestCase
-{
-    /**
-     * @dataProvider getTransportData
-     */
-    public function testToString(SesHttpTransport $transport, string $expected)
-    {
-        $this->assertSame($expected, (string) $transport);
-    }
-
-    public function getTransportData()
-    {
-        return [
-            [
-                new SesHttpTransport('ACCESS_KEY', 'SECRET_KEY'),
-                'ses+https://ACCESS_KEY@email.eu-west-1.amazonaws.com',
-            ],
-            [
-                new SesHttpTransport('ACCESS_KEY', 'SECRET_KEY', 'us-east-1'),
-                'ses+https://ACCESS_KEY@email.us-east-1.amazonaws.com',
-            ],
-            [
-                (new SesHttpTransport('ACCESS_KEY', 'SECRET_KEY'))->setHost('example.com'),
-                'ses+https://ACCESS_KEY@example.com',
-            ],
-            [
-                (new SesHttpTransport('ACCESS_KEY', 'SECRET_KEY'))->setHost('example.com')->setPort(99),
-                'ses+https://ACCESS_KEY@example.com:99',
-            ],
-        ];
-    }
-
-    public function testSend()
-    {
-        $client = new MockHttpClient(function (string $method, string $url, array $options): ResponseInterface {
-            $this->assertSame('POST', $method);
-            $this->assertSame('https://email.eu-west-1.amazonaws.com:8984/', $url);
-            $this->assertStringContainsString('AWS3-HTTPS AWSAccessKeyId=ACCESS_KEY,Algorithm=HmacSHA256,Signature=', $options['headers'][0] ?? $options['request_headers'][0]);
-
-            parse_str($options['body'], $body);
-
-            $this->assertArrayHasKey('Destinations_member_1', $body);
-            $this->assertSame('saif.gmati@symfony.com', $body['Destinations_member_1']);
-            $this->assertArrayHasKey('Destinations_member_2', $body);
-            $this->assertSame('jeremy@derusse.com', $body['Destinations_member_2']);
-
-            $content = base64_decode($body['RawMessage_Data']);
-
-            $this->assertStringContainsString('Hello!', $content);
-            $this->assertStringContainsString('Saif Eddin <saif.gmati@symfony.com>', $content);
-            $this->assertStringContainsString('Fabien <fabpot@symfony.com>', $content);
-            $this->assertStringContainsString('Hello There!', $content);
-
-            $this->assertSame('aws-configuration-set-name', $body['ConfigurationSetName']);
-            $this->assertSame('aws-source-arn', $body['FromEmailAddressIdentityArn']);
-
-            $xml = '<SendEmailResponse xmlns="https://email.amazonaws.com/doc/2010-03-31/">
-  <SendRawEmailResult>
-    <MessageId>foobar</MessageId>
-  </SendRawEmailResult>
-</SendEmailResponse>';
-
-            return new MockResponse($xml, [
-                'http_code' => 200,
-            ]);
-        });
-        $transport = new SesHttpTransport('ACCESS_KEY', 'SECRET_KEY', null, $client);
-        $transport->setPort(8984);
-
-        $mail = new Email();
-        $mail->subject('Hello!')
-            ->to(new Address('saif.gmati@symfony.com', 'Saif Eddin'))
-            ->bcc(new Address('jeremy@derusse.com', 'Jérémy Derussé'))
-            ->from(new Address('fabpot@symfony.com', 'Fabien'))
-            ->text('Hello There!');
-
-        $mail->getHeaders()->addTextHeader('X-SES-CONFIGURATION-SET', 'aws-configuration-set-name');
-        $mail->getHeaders()->addTextHeader('X-SES-SOURCE-ARN', 'aws-source-arn');
-
-        $message = $transport->send($mail);
-
-        $this->assertSame('foobar', $message->getMessageId());
-    }
-
-    public function testSendThrowsForErrorResponse()
-    {
-        $client = new MockHttpClient(function (string $method, string $url, array $options): ResponseInterface {
-            $xml = "<SendEmailResponse xmlns=\"https://email.amazonaws.com/doc/2010-03-31/\">
-                <Error>
-                    <Message>i'm a teapot</Message>
-                    <Code>418</Code>
-                </Error>
-            </SendEmailResponse>";
-
-            return new MockResponse($xml, [
-                'http_code' => 418,
-            ]);
-        });
-        $transport = new SesHttpTransport('ACCESS_KEY', 'SECRET_KEY', null, $client);
-
-        $mail = new Email();
-        $mail->subject('Hello!')
-            ->to(new Address('saif.gmati@symfony.com', 'Saif Eddin'))
-            ->from(new Address('fabpot@symfony.com', 'Fabien'))
-            ->text('Hello There!');
-
-        $this->expectException(HttpTransportException::class);
-        $this->expectExceptionMessage('Unable to send an email: i\'m a teapot (code 418).');
-        $transport->send($mail);
-    }
-}
diff --git a/src/Symfony/Component/Mailer/Bridge/Amazon/Transport/SesApiTransport.php b/src/Symfony/Component/Mailer/Bridge/Amazon/Transport/SesApiTransport.php
deleted file mode 100644
index 37e08729f9d0d..0000000000000
--- a/src/Symfony/Component/Mailer/Bridge/Amazon/Transport/SesApiTransport.php
+++ /dev/null
@@ -1,156 +0,0 @@
-<?php
-
-/*
- * This file is part of the Symfony package.
- *
- * (c) Fabien Potencier <fabien@symfony.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Symfony\Component\Mailer\Bridge\Amazon\Transport;
-
-use Psr\Log\LoggerInterface;
-use Symfony\Component\Mailer\Envelope;
-use Symfony\Component\Mailer\Exception\HttpTransportException;
-use Symfony\Component\Mailer\SentMessage;
-use Symfony\Component\Mailer\Transport\AbstractApiTransport;
-use Symfony\Component\Mime\Address;
-use Symfony\Component\Mime\Email;
-use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
-use Symfony\Contracts\HttpClient\HttpClientInterface;
-use Symfony\Contracts\HttpClient\ResponseInterface;
-
-trigger_deprecation('symfony/amazon-mailer', '5.1', 'The "%s" class is deprecated, use "%s" instead. The Amazon transport now requires "AsyncAws". Run "composer require async-aws/ses".', SesApiTransport::class, SesApiAsyncAwsTransport::class);
-
-/**
- * @author Kevin Verschaeve
- */
-class SesApiTransport extends AbstractApiTransport
-{
-    private const HOST = 'email.%region%.amazonaws.com';
-
-    private $accessKey;
-    private $secretKey;
-    private $region;
-
-    /**
-     * @param string|null $region Amazon SES region
-     */
-    public function __construct(string $accessKey, string $secretKey, string $region = null, HttpClientInterface $client = null, EventDispatcherInterface $dispatcher = null, LoggerInterface $logger = null)
-    {
-        $this->accessKey = $accessKey;
-        $this->secretKey = $secretKey;
-        $this->region = $region ?: 'eu-west-1';
-
-        parent::__construct($client, $dispatcher, $logger);
-    }
-
-    public function __toString(): string
-    {
-        return sprintf('ses+api://%s@%s', $this->accessKey, $this->getEndpoint());
-    }
-
-    protected function doSendApi(SentMessage $sentMessage, Email $email, Envelope $envelope): ResponseInterface
-    {
-        $date = gmdate('D, d M Y H:i:s e');
-        $auth = sprintf('AWS3-HTTPS AWSAccessKeyId=%s,Algorithm=HmacSHA256,Signature=%s', $this->accessKey, $this->getSignature($date));
-
-        $response = $this->client->request('POST', 'https://'.$this->getEndpoint(), [
-            'headers' => [
-                'X-Amzn-Authorization' => $auth,
-                'Date' => $date,
-                'Content-Type' => 'application/x-www-form-urlencoded',
-            ],
-            'body' => $payload = $this->getPayload($email, $envelope),
-        ]);
-
-        $result = new \SimpleXMLElement($response->getContent(false));
-        if (200 !== $response->getStatusCode()) {
-            throw new HttpTransportException('Unable to send an email: '.$result->Error->Message.sprintf(' (code %d).', $result->Error->Code), $response);
-        }
-
-        $property = $payload['Action'].'Result';
-
-        $sentMessage->setMessageId($result->{$property}->MessageId);
-
-        return $response;
-    }
-
-    private function getEndpoint(): ?string
-    {
-        return ($this->host ?: str_replace('%region%', $this->region, self::HOST)).($this->port ? ':'.$this->port : '');
-    }
-
-    private function getSignature(string $string): string
-    {
-        return base64_encode(hash_hmac('sha256', $string, $this->secretKey, true));
-    }
-
-    private function getPayload(Email $email, Envelope $envelope): array
-    {
-        if ($email->getAttachments()) {
-            $payload = [
-                'Action' => 'SendRawEmail',
-                'RawMessage.Data' => base64_encode($email->toString()),
-            ];
-
-            if ($header = $email->getHeaders()->get('X-SES-CONFIGURATION-SET')) {
-                $payload['ConfigurationSetName'] = $header->getBodyAsString();
-            }
-
-            if ($header = $email->getHeaders()->get('X-SES-SOURCE-ARN')) {
-                $payload['FromEmailAddressIdentityArn'] = $header->getBodyAsString();
-            }
-
-            return $payload;
-        }
-
-        $payload = [
-            'Action' => 'SendEmail',
-            'Destination.ToAddresses.member' => $this->stringifyAddresses($this->getRecipients($email, $envelope)),
-            'Message.Subject.Data' => $email->getSubject(),
-            'Source' => $envelope->getSender()->toString(),
-        ];
-
-        if ($emails = $email->getCc()) {
-            $payload['Destination.CcAddresses.member'] = $this->stringifyAddresses($emails);
-        }
-        if ($emails = $email->getBcc()) {
-            $payload['Destination.BccAddresses.member'] = $this->stringifyAddresses($emails);
-        }
-        if ($email->getTextBody()) {
-            $payload['Message.Body.Text.Data'] = $email->getTextBody();
-        }
-        if ($email->getHtmlBody()) {
-            $payload['Message.Body.Html.Data'] = $email->getHtmlBody();
-        }
-        if ($email->getReplyTo()) {
-            $payload['ReplyToAddresses.member'] = $this->stringifyAddresses($email->getReplyTo());
-        }
-        if ($header = $email->getHeaders()->get('X-SES-CONFIGURATION-SET')) {
-            $payload['ConfigurationSetName'] = $header->getBodyAsString();
-        }
-        if ($header = $email->getHeaders()->get('X-SES-SOURCE-ARN')) {
-            $payload['FromEmailAddressIdentityArn'] = $header->getBodyAsString();
-        }
-
-        return $payload;
-    }
-
-    protected function stringifyAddresses(array $addresses): array
-    {
-        return array_map(function (Address $a) {
-            // AWS does not support UTF-8 address
-            if (preg_match('~[\x00-\x08\x10-\x19\x7F-\xFF\r\n]~', $name = $a->getName())) {
-                return sprintf('=?UTF-8?B?%s?= <%s>',
-                    base64_encode($name),
-                    $a->getEncodedAddress()
-                );
-            }
-
-            return $a->toString();
-        }, $addresses);
-    }
-}
diff --git a/src/Symfony/Component/Mailer/Bridge/Amazon/Transport/SesHttpTransport.php b/src/Symfony/Component/Mailer/Bridge/Amazon/Transport/SesHttpTransport.php
deleted file mode 100644
index 779566788af32..0000000000000
--- a/src/Symfony/Component/Mailer/Bridge/Amazon/Transport/SesHttpTransport.php
+++ /dev/null
@@ -1,106 +0,0 @@
-<?php
-
-/*
- * This file is part of the Symfony package.
- *
- * (c) Fabien Potencier <fabien@symfony.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Symfony\Component\Mailer\Bridge\Amazon\Transport;
-
-use Psr\Log\LoggerInterface;
-use Symfony\Component\Mailer\Exception\HttpTransportException;
-use Symfony\Component\Mailer\SentMessage;
-use Symfony\Component\Mailer\Transport\AbstractHttpTransport;
-use Symfony\Component\Mime\Message;
-use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
-use Symfony\Contracts\HttpClient\HttpClientInterface;
-use Symfony\Contracts\HttpClient\ResponseInterface;
-
-trigger_deprecation('symfony/amazon-mailer', '5.1', 'The "%s" class is deprecated, use "%s" instead. The Amazon transport now requires "AsyncAws". Run "composer require async-aws/ses".', SesHttpTransport::class, SesHttpAsyncAwsTransport::class);
-
-/**
- * @author Kevin Verschaeve
- */
-class SesHttpTransport extends AbstractHttpTransport
-{
-    private const HOST = 'email.%region%.amazonaws.com';
-
-    private $accessKey;
-    private $secretKey;
-    private $region;
-
-    /**
-     * @param string|null $region Amazon SES region
-     */
-    public function __construct(string $accessKey, string $secretKey, string $region = null, HttpClientInterface $client = null, EventDispatcherInterface $dispatcher = null, LoggerInterface $logger = null)
-    {
-        $this->accessKey = $accessKey;
-        $this->secretKey = $secretKey;
-        $this->region = $region ?: 'eu-west-1';
-
-        parent::__construct($client, $dispatcher, $logger);
-    }
-
-    public function __toString(): string
-    {
-        return sprintf('ses+https://%s@%s', $this->accessKey, $this->getEndpoint());
-    }
-
-    protected function doSendHttp(SentMessage $message): ResponseInterface
-    {
-        $date = gmdate('D, d M Y H:i:s e');
-        $auth = sprintf('AWS3-HTTPS AWSAccessKeyId=%s,Algorithm=HmacSHA256,Signature=%s', $this->accessKey, $this->getSignature($date));
-
-        $request = [
-            'headers' => [
-                'X-Amzn-Authorization' => $auth,
-                'Date' => $date,
-            ],
-            'body' => [
-                'Action' => 'SendRawEmail',
-                'RawMessage.Data' => base64_encode($message->toString()),
-            ],
-        ];
-
-        $index = 1;
-        foreach ($message->getEnvelope()->getRecipients() as $recipient) {
-            $request['body']['Destinations.member.'.$index++] = $recipient->getAddress();
-        }
-
-        if ($message->getOriginalMessage() instanceof Message
-            && $configurationSetHeader = $message->getOriginalMessage()->getHeaders()->get('X-SES-CONFIGURATION-SET')
-        ) {
-            $request['body']['ConfigurationSetName'] = $configurationSetHeader->getBodyAsString();
-        }
-
-        if ($message->getOriginalMessage() instanceof Message
-            && $sourceArnHeader = $message->getOriginalMessage()->getHeaders()->get('X-SES-SOURCE-ARN')) {
-            $request['body']['FromEmailAddressIdentityArn'] = $sourceArnHeader->getBodyAsString();
-        }
-
-        $response = $this->client->request('POST', 'https://'.$this->getEndpoint(), $request);
-
-        $result = new \SimpleXMLElement($response->getContent(false));
-        if (200 !== $response->getStatusCode()) {
-            throw new HttpTransportException('Unable to send an email: '.$result->Error->Message.sprintf(' (code %d).', $result->Error->Code), $response);
-        }
-
-        $message->setMessageId($result->SendRawEmailResult->MessageId);
-
-        return $response;
-    }
-
-    private function getEndpoint(): ?string
-    {
-        return ($this->host ?: str_replace('%region%', $this->region, self::HOST)).($this->port ? ':'.$this->port : '');
-    }
-
-    private function getSignature(string $string): string
-    {
-        return base64_encode(hash_hmac('sha256', $string, $this->secretKey, true));
-    }
-}
diff --git a/src/Symfony/Component/Mailer/Bridge/Amazon/composer.json b/src/Symfony/Component/Mailer/Bridge/Amazon/composer.json
index dce785fb91f44..582693fc47e88 100644
--- a/src/Symfony/Component/Mailer/Bridge/Amazon/composer.json
+++ b/src/Symfony/Component/Mailer/Bridge/Amazon/composer.json
@@ -18,7 +18,6 @@
     "require": {
         "php": ">=8.0.2",
         "async-aws/ses": "^1.0",
-        "symfony/deprecation-contracts": "^2.1",
         "symfony/mailer": "^5.4|^6.0"
     },
     "require-dev": {
diff --git a/src/Symfony/Component/Mailer/Bridge/Mailgun/composer.json b/src/Symfony/Component/Mailer/Bridge/Mailgun/composer.json
index b30b104206344..e4547cdd5d83d 100644
--- a/src/Symfony/Component/Mailer/Bridge/Mailgun/composer.json
+++ b/src/Symfony/Component/Mailer/Bridge/Mailgun/composer.json
@@ -17,7 +17,6 @@
     ],
     "require": {
         "php": ">=8.0.2",
-        "symfony/deprecation-contracts": "^2.1",
         "symfony/mailer": "^5.4|^6.0"
     },
     "require-dev": {
diff --git a/src/Symfony/Component/Mailer/CHANGELOG.md b/src/Symfony/Component/Mailer/CHANGELOG.md
index 2d0f1faddbf1a..fd30774753ea0 100644
--- a/src/Symfony/Component/Mailer/CHANGELOG.md
+++ b/src/Symfony/Component/Mailer/CHANGELOG.md
@@ -1,6 +1,11 @@
 CHANGELOG
 =========
 
+6.0
+---
+
+ * The `HttpTransportException` class takes a string at first argument
+
 5.3
 ---
 
diff --git a/src/Symfony/Component/Mailer/Exception/HttpTransportException.php b/src/Symfony/Component/Mailer/Exception/HttpTransportException.php
index c72eb6cf6e3ee..01650f0344e80 100644
--- a/src/Symfony/Component/Mailer/Exception/HttpTransportException.php
+++ b/src/Symfony/Component/Mailer/Exception/HttpTransportException.php
@@ -20,14 +20,8 @@ class HttpTransportException extends TransportException
 {
     private $response;
 
-    public function __construct(?string $message, ResponseInterface $response, int $code = 0, \Throwable $previous = null)
+    public function __construct(string $message, ResponseInterface $response, int $code = 0, \Throwable $previous = null)
     {
-        if (null === $message) {
-            trigger_deprecation('symfony/mailer', '5.3', 'Passing null as $message to "%s()" is deprecated, pass an empty string instead.', __METHOD__);
-
-            $message = '';
-        }
-
         parent::__construct($message, $code, $previous);
 
         $this->response = $response;
diff --git a/src/Symfony/Component/Mailer/composer.json b/src/Symfony/Component/Mailer/composer.json
index 774100c4c6deb..363702c66646d 100644
--- a/src/Symfony/Component/Mailer/composer.json
+++ b/src/Symfony/Component/Mailer/composer.json
@@ -19,7 +19,6 @@
         "php": ">=8.0.2",
         "egulias/email-validator": "^2.1.10|^3",
         "psr/log": "~1.0",
-        "symfony/deprecation-contracts": "^2.1",
         "symfony/event-dispatcher": "^5.4|^6.0",
         "symfony/mime": "^5.4|^6.0",
         "symfony/service-contracts": "^1.1|^2"

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