Potential fix for #54; ensures the Encoding property of the ImapCli…

…ent is used, and default the charset to `ISO-8859-1`.

ImapClient.cs

@@ -424,20 +424,24 @@ public MailMessage[] GetMessages(string start, string end, bool uid, bool header
         foreach (var key in imapHeaders.AllKeys.Except(new[] { "UID", "Flags", "BODY[]", "BODY[HEADER]" }, StringComparer.OrdinalIgnoreCase))
           mail.Headers.Add(key, new HeaderValue(imapHeaders[key]));
 
-        var body = new StringBuilder();
-        int remaining = mail.Size;
-        var buffer = new byte[8192];
-        int read;
-        while (remaining > 0) {
-          read = _Stream.Read(buffer, 0, Math.Min(remaining, buffer.Length));
-          body.Append(System.Text.Encoding.UTF8.GetString(buffer, 0, read));
-          remaining -= read;
-        }
+        using (var body = new System.IO.MemoryStream()) {
+          int remaining = mail.Size;
+          var buffer = new byte[8192];
+          int read;
+          while (remaining > 0) {
+            read = _Stream.Read(buffer, 0, Math.Min(remaining, buffer.Length));
+            body.Write(buffer, 0, read);
+            remaining -= read;
+          }
 
-        var next = Convert.ToChar(_Stream.ReadByte());
-        System.Diagnostics.Debug.Assert(next == ')');
+          var next = Convert.ToChar(_Stream.ReadByte());
+          System.Diagnostics.Debug.Assert(next == ')');
 
-        mail.Load(body.ToString(), headersonly);
+          body.Position = 0;
+          using (var rdr = new System.IO.StreamReader(body, Encoding)) {
+            mail.Load(rdr, headersonly);
+          }
+        }
 
         x.Add(mail);
       }

TextClient.cs

@@ -16,7 +16,7 @@ public abstract class TextClient : IDisposable {
     public System.Text.Encoding Encoding { get; set; }
 
     public TextClient() {
-      Encoding = System.Text.Encoding.UTF8;
+      Encoding = Utilities.ParseCharsetToEncoding("ISO-8859-1");
     }
 
     internal abstract void OnLogin(string username, string password);