diff --git a/src/Symfony/Bridge/Twig/Mime/BodyRenderer.php b/src/Symfony/Bridge/Twig/Mime/BodyRenderer.php
index d5b6d14c139a0..d4e9c203e811f 100644
--- a/src/Symfony/Bridge/Twig/Mime/BodyRenderer.php
+++ b/src/Symfony/Bridge/Twig/Mime/BodyRenderer.php
@@ -74,7 +74,7 @@ public function render(Message $message): void
             // if text body is empty, compute one from the HTML body
             if (!$message->getTextBody() && null !== $html = $message->getHtmlBody()) {
                 $text = $this->converter->convert(\is_resource($html) ? stream_get_contents($html) : $html, $message->getHtmlCharset());
-                $message->text($text, $message->getHtmlCharset());
+                $message->text($text, $message->getHtmlCharset(), $message->getHtmlEncoding());
             }
         };
 
diff --git a/src/Symfony/Bridge/Twig/Tests/Mime/TemplatedEmailTest.php b/src/Symfony/Bridge/Twig/Tests/Mime/TemplatedEmailTest.php
index f77b3ad4b5337..1f248d76d24ab 100644
--- a/src/Symfony/Bridge/Twig/Tests/Mime/TemplatedEmailTest.php
+++ b/src/Symfony/Bridge/Twig/Tests/Mime/TemplatedEmailTest.php
@@ -75,8 +75,10 @@ public function testSymfonySerialize()
     },
     "text": null,
     "textCharset": null,
+    "textEncoding": null,
     "html": null,
     "htmlCharset": null,
+    "htmlEncoding": null,
     "attachments": [
         {%A
             "body": "Some Text file",%A
@@ -124,4 +126,17 @@ public function testSymfonySerialize()
         $this->assertEquals($expected->getHeaders(), $n->getHeaders());
         $this->assertEquals($expected->getBody(), $n->getBody());
     }
+
+    public function testHtmlEncoding()
+    {
+        $email = new TemplatedEmail();
+
+        $email
+            ->htmlTemplate('text.html.twig')
+            ->context(['a' => 'b']);
+        $this->assertNull($email->getHtmlEncoding());
+
+        $email->htmlEncoding('base64');
+        $this->assertSame('base64', $email->getHtmlEncoding());
+    }
 }
diff --git a/src/Symfony/Component/Mime/Email.php b/src/Symfony/Component/Mime/Email.php
index 233afc075a7bc..90932686190de 100644
--- a/src/Symfony/Component/Mime/Email.php
+++ b/src/Symfony/Component/Mime/Email.php
@@ -45,6 +45,7 @@ class Email extends Message
     private $text;
 
     private ?string $textCharset = null;
+    private ?string $textEncoding = null;
 
     /**
      * @var resource|string|null
@@ -52,6 +53,7 @@ class Email extends Message
     private $html;
 
     private ?string $htmlCharset = null;
+    private ?string $htmlEncoding = null;
     private array $attachments = [];
     private ?AbstractPart $cachedBody = null; // Used to avoid wrong body hash in DKIM signatures with multiple parts (e.g. HTML + TEXT) due to multiple boundaries.
 
@@ -267,7 +269,7 @@ public function getPriority(): int
      *
      * @return $this
      */
-    public function text($body, string $charset = 'utf-8'): static
+    public function text($body, string $charset = 'utf-8', ?string $encoding = null): static
     {
         if (null !== $body && !\is_string($body) && !\is_resource($body)) {
             throw new \TypeError(sprintf('The body must be a string, a resource or null (got "%s").', get_debug_type($body)));
@@ -276,6 +278,7 @@ public function text($body, string $charset = 'utf-8'): static
         $this->cachedBody = null;
         $this->text = $body;
         $this->textCharset = $charset;
+        $this->textEncoding = $encoding ?? $this->textEncoding;
 
         return $this;
     }
@@ -293,12 +296,27 @@ public function getTextCharset(): ?string
         return $this->textCharset;
     }
 
+    public function getTextEncoding(): ?string
+    {
+        return $this->textEncoding;
+    }
+
+    /**
+     * @return $this
+     */
+    public function textEncoding(?string $encoding = null): static
+    {
+        $this->textEncoding = $encoding;
+
+        return $this;
+    }
+
     /**
      * @param resource|string|null $body
      *
      * @return $this
      */
-    public function html($body, string $charset = 'utf-8'): static
+    public function html($body, string $charset = 'utf-8', ?string $encoding = null): static
     {
         if (null !== $body && !\is_string($body) && !\is_resource($body)) {
             throw new \TypeError(sprintf('The body must be a string, a resource or null (got "%s").', get_debug_type($body)));
@@ -307,6 +325,7 @@ public function html($body, string $charset = 'utf-8'): static
         $this->cachedBody = null;
         $this->html = $body;
         $this->htmlCharset = $charset;
+        $this->htmlEncoding = $encoding ?? $this->htmlEncoding;
 
         return $this;
     }
@@ -324,6 +343,21 @@ public function getHtmlCharset(): ?string
         return $this->htmlCharset;
     }
 
+    public function getHtmlEncoding(): ?string
+    {
+        return $this->htmlEncoding;
+    }
+
+    /**
+     * @return $this
+     */
+    public function htmlEncoding(?string $encoding = null): static
+    {
+        $this->htmlEncoding = $encoding;
+
+        return $this;
+    }
+
     /**
      * @param resource|string $body
      *
@@ -436,7 +470,7 @@ private function generateBody(): AbstractPart
 
         [$htmlPart, $otherParts, $relatedParts] = $this->prepareParts();
 
-        $part = null === $this->text ? null : new TextPart($this->text, $this->textCharset);
+        $part = null === $this->text ? null : new TextPart($this->text, $this->textCharset, 'plain', $this->textEncoding);
         if (null !== $htmlPart) {
             if (null !== $part) {
                 $part = new AlternativePart($part, $htmlPart);
@@ -503,7 +537,7 @@ private function prepareParts(): ?array
             $otherParts[] = $part;
         }
         if (null !== $htmlPart) {
-            $htmlPart = new TextPart($html, $this->htmlCharset, 'html');
+            $htmlPart = new TextPart($html, $this->htmlCharset, 'html', $this->htmlEncoding);
         }
 
         return [$htmlPart, $otherParts, array_values($relatedParts)];
@@ -561,7 +595,7 @@ public function __serialize(): array
             $this->html = (new TextPart($this->html))->getBody();
         }
 
-        return [$this->text, $this->textCharset, $this->html, $this->htmlCharset, $this->attachments, parent::__serialize()];
+        return [$this->text, $this->textCharset, $this->textEncoding, $this->html, $this->htmlCharset, $this->htmlEncoding, $this->attachments, parent::__serialize()];
     }
 
     /**
@@ -569,7 +603,7 @@ public function __serialize(): array
      */
     public function __unserialize(array $data): void
     {
-        [$this->text, $this->textCharset, $this->html, $this->htmlCharset, $this->attachments, $parentData] = $data;
+        [$this->text, $this->textCharset, $this->textEncoding, $this->html, $this->htmlCharset, $this->htmlEncoding, $this->attachments, $parentData] = $data;
 
         parent::__unserialize($parentData);
     }
diff --git a/src/Symfony/Component/Mime/Tests/EmailTest.php b/src/Symfony/Component/Mime/Tests/EmailTest.php
index ae61f26f605b4..023c7d6eed36a 100644
--- a/src/Symfony/Component/Mime/Tests/EmailTest.php
+++ b/src/Symfony/Component/Mime/Tests/EmailTest.php
@@ -532,8 +532,10 @@ public function testSymfonySerialize()
 {
     "text": "Text content",
     "textCharset": "utf-8",
+    "textEncoding": null,
     "html": "HTML <b>content</b>",
     "htmlCharset": "utf-8",
+    "htmlEncoding": null,
     "attachments": [
         {
             "filename": "test.txt",
@@ -695,4 +697,48 @@ public function testEmailsWithAttachmentsWhichAreAFileInstanceCanBeUnserialized(
         $this->assertCount(1, $attachments);
         $this->assertStringContainsString('foo_bar_xyz_123', $attachments[0]->getBody());
     }
+
+    public function testTextEncoding()
+    {
+        $email = new Email();
+
+        $email->text('foo');
+        $this->assertNull($email->getTextEncoding());
+
+        $email->textEncoding('base64');
+        $this->assertSame('base64', $email->getTextEncoding());
+
+        $email->textEncoding(null);
+        $this->assertNull($email->getTextEncoding());
+
+        $email->text('foo', 'utf-8', 'base64');
+        $this->assertSame('base64', $email->getTextEncoding());
+
+        $email = new Email();
+        $email->textEncoding('base64');
+        $email->text('foo');
+        $this->assertSame('base64', $email->getTextEncoding());
+    }
+
+    public function testHtmlEncoding()
+    {
+        $email = new Email();
+
+        $email->html('foo');
+        $this->assertNull($email->getHtmlEncoding());
+
+        $email->htmlEncoding('base64');
+        $this->assertSame('base64', $email->getHtmlEncoding());
+
+        $email->htmlEncoding(null);
+        $this->assertNull($email->getHtmlEncoding());
+
+        $email->html('foo', 'utf-8', 'base64');
+        $this->assertSame('base64', $email->getHtmlEncoding());
+
+        $email = new Email();
+        $email->htmlEncoding('base64');
+        $email->html('foo');
+        $this->assertSame('base64', $email->getHtmlEncoding());
+    }
 }