diff --git a/Wino.Core.Domain/Extensions/MimeExtensions.cs b/Wino.Core.Domain/Extensions/MimeExtensions.cs
index 31f918b4..1555e932 100644
--- a/Wino.Core.Domain/Extensions/MimeExtensions.cs
+++ b/Wino.Core.Domain/Extensions/MimeExtensions.cs
@@ -1,4 +1,5 @@
 using System;
+using System.IO;
 
 namespace Wino.Core.Domain.Extensions
 {
@@ -6,12 +7,11 @@ namespace Wino.Core.Domain.Extensions
     {
         public static string GetBase64MimeMessage(this MimeKit.MimeMessage message)
         {
-            using System.IO.MemoryStream memoryStream = new();
-            message.WriteTo(MimeKit.FormatOptions.Default, memoryStream);
-            byte[] buffer = memoryStream.GetBuffer();
-            int count = (int)memoryStream.Length;
+            using MemoryStream memoryStream = new();
 
-            return Convert.ToBase64String(buffer);
+            message.WriteTo(memoryStream);
+
+            return Convert.ToBase64String(memoryStream.ToArray());
         }
 
         public static MimeKit.MimeMessage GetMimeMessageFromBase64(this string base64)