refactor: use new mail interface desing

Signed-off-by: Sebastian Krupinski <krupinski01@gmail.com>

lib/Client/Message.php

@@ -21,6 +21,7 @@ final class Message
         private readonly int $uid,
         private readonly int $size,
         private readonly ?string $internalDate,
+        private readonly ?string $receivedAt,
         private readonly array $flags,
         private readonly ?string $subject,
         private readonly ?string $sentAt,
@@ -56,6 +57,11 @@ final class Message
         return $this->internalDate;
     }
 
+    public function receivedAt(): ?string
+    {
+        return $this->receivedAt;
+    }
+
     /**
      * @return list<string>
      */
@@ -139,7 +145,7 @@ final class Message
 
     public function bodyText(): ?string
     {
-        return $this->bodyText;
+        return $this->bodySections['TEXT'] ?? null;
     }
 
     /**
@@ -160,6 +166,7 @@ final class Message
             $this->uid,
             $this->size,
             $this->internalDate,
+            $this->receivedAt,
             $this->flags,
             $this->subject,
             $this->sentAt,