diff --git a/imap.cabal b/imap.cabal
--- a/imap.cabal
+++ b/imap.cabal
@@ -2,7 +2,7 @@
 -- see http://haskell.org/cabal/users-guide/
 
 name:                imap
-version:             0.2.0.2
+version:             0.2.0.3
 synopsis:            An efficient IMAP client library, with SSL and streaming
 license:             BSD3
 license-file:        LICENSE
diff --git a/src/Network/IMAP/Parsers/Utils.hs b/src/Network/IMAP/Parsers/Utils.hs
--- a/src/Network/IMAP/Parsers/Utils.hs
+++ b/src/Network/IMAP/Parsers/Utils.hs
@@ -80,7 +80,24 @@
   return $ ListR nameAttributes delimiter actualName
 
 isAtomChar :: Word8 -> Bool
-isAtomChar c = isLetter c || isNumber c || c == _hyphen || c == _quotedbl || c == _period
+isAtomChar c = isLetter c 
+            || isNumber c 
+            || c == _hyphen 
+            || c == _quotedbl 
+            || c == _period 
+            || c == _plus 
+            || c == _dollar
+            || c == _ampersand
+            || c == _quotesingle
+            || c == _comma
+            || c == _hyphen
+            || c == _period
+            || c == _slash
+            || (c >= 0x3a && c <= 0x3c)
+            || (c >= 0x3e && c <= 0x40)
+            || c == _backslash
+            || (c >= 0x5e && c <= 0x60)
+            || c == _tilde
 
 toInt :: BSC.ByteString -> Either ErrorMessage Int
 toInt bs = if null parsed