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diff --git a/Lazymail/Maildir.hs b/Lazymail/Maildir.hs
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+{- Utilities for working with Maildir format.
+ -
+ - Copyright 2013 Raúl Benencia <rul@kalgan.cc>
+ -
+ - Licensed under the GNU GPL version 3 or higher
+ -
+ -}
+
+module Lazymail.Maildir  where
+
+import Control.Monad.Loops(allM)
+import Control.Monad (forM, filterM)
+import Data.List(isPrefixOf)
+import System.Directory (doesDirectoryExist, getDirectoryContents, renameFile)
+import System.FilePath ((</>), takeFileName, takeDirectory, splitDirectories, joinPath)
+import System.IO(IOMode(..), hGetContents, openFile)
+
+import Lazymail.Types(Maildir, Flag(..), Flags)
+
+isMaildir :: FilePath -> IO Bool
+isMaildir fp = allM doesDirectoryExist [ fp
+                                       , fp </> "cur"
+                                       , fp </> "new"
+                                       , fp </> "tmp"]
+
+getMaildirEmails md = do
+  r <- (getReadEmails md)
+  n <- (getNewEmails md)
+  return $ r ++ n
+
+getReadEmails md = getEmails $ md </> "cur"
+getNewEmails  md = getEmails $ md </> "new"
+
+getEmails fp = do
+  contents <- getDirectoryContents fp
+  return $  map (fp </>) $ filter (`notElem` [".", ".."]) contents
+
+{- | Returns information about specific messages. -}
+getMessages :: Maildir -> [FilePath] -> IO [(FilePath, Flags, String)]
+getMessages mb list =  do
+  messages <- getAll mb
+  return $ filter (\(id, f, m) -> id `elem` list) messages
+  
+{- Given a mail in a Maildir, mark it as read -}
+markAsRead :: FilePath -> IO FilePath
+markAsRead fp =
+  case newPath of
+    Nothing -> return fp
+    Just path -> do
+      renameFile fp path
+      return path
+  where newPath = 
+          if not $ isNew fp
+          then Just fp
+          else do
+            let fil = takeFileName fp
+            let dir = takeDirectory fp
+            let spl = splitDirectories dir
+            case last spl of
+              "cur" -> Just $ fp ++ "S"
+              "new" -> Just $ (joinPath . init $ spl) </> ("cur" </> (fil ++ "S"))
+              _     -> Nothing
+
+
+-- Based on getRecursiveContents from Real World Haskell
+getMaildirsRecursively :: FilePath -> IO [Maildir]
+getMaildirsRecursively topdir = do
+  result <- search topdir
+  includeTopDir <- isMaildir topdir
+  if includeTopDir
+     then return (topdir:result)
+     else return result
+
+  where
+    search topdir = do
+      names <- getDirectoryContents topdir
+      let properNames = filter (`notElem` [".", ".."]) names
+      paths <- forM properNames $ \name -> do
+        let path = topdir </> name
+        isDirectory <- doesDirectoryExist path
+        if isDirectory
+          then do
+            result <- search path
+            return ([path] ++ result)
+          else return []
+
+      filterM isMaildir (concat paths)
+
+
+{- The following code is an implementation of the Mailbox interface -}
+listIDs :: Maildir -> IO [FilePath]
+listIDs md = getNewIDs md `appendM` getReadIDs md
+  where mxs `appendM` mxs' = do
+          xs  <- mxs
+          xs' <- mxs'
+          return (xs ++ xs')
+
+getNewIDs :: Maildir -> IO [FilePath]
+getNewIDs md = getIDs (md </> "new")
+
+getReadIDs :: Maildir -> IO [FilePath]
+getReadIDs md = getIDs (md </> "cur")
+
+getIDs :: FilePath -> IO [FilePath]
+getIDs fp = do
+  names <-getDirectoryContents fp
+  let properNames = filter (`notElem` [".", ".."]) names
+  return $ map (fp </>) properNames
+
+listMessageFlags :: Maildir -> IO [(FilePath, Flags)]
+listMessageFlags fp = do
+  ids <- (listIDs fp)
+  let flags = map getFlags ids
+  return (zip ids flags)
+
+getFlags :: FilePath -> Flags
+getFlags fp = addNew $ map toFlag $ strip fp
+  where strip x
+          | null x               = []
+          | ":2," `isPrefixOf` x = drop 3 x
+          | otherwise            = let (discard, analyze) = span (/= ':') fp
+                                   in strip analyze
+        addNew flags = if elem SEEN flags then flags else (NEW:flags)
+
+isNew :: FilePath -> Bool
+isNew fp = elem NEW $ getFlags fp
+
+toFlag :: Char -> Flag
+toFlag c | c == 'S'  = SEEN
+         | c == 'A'  = ANSWERED
+         | c == 'F'  = FLAGGED
+         | c == 'D'  = DRAFT
+         | c == 'P'  = FORWARDED
+         | c == 'T'  = DELETED
+         | otherwise = OTHERFLAG [c]
+
+getAll :: Maildir -> IO [(FilePath, Flags, String)]
+getAll fp = do
+  ids <- listIDs fp
+  msgs <- mapM (\x -> hGetContents =<< openFile x ReadMode) ids
+  let flags = map getFlags ids
+  return $ zip3 ids flags msgs