diff --git a/src/Laskutin.hs b/src/Laskutin.hs
index 2a862bd..3ccd1ce 100644
--- a/src/Laskutin.hs
+++ b/src/Laskutin.hs
@@ -30,10 +30,10 @@ main = do
       UpdateTable bankCsv -> updateTableMain csv bankCsv
 
 sendInvoicesMain :: FilePath -> SendOptions -> IO ()
-sendInvoicesMain csvPath options@SendOptions {email, sendmail} = do
-    invoices <- readInvoices csvPath options
+sendInvoicesMain csvPath options@SendOptions {email, sendmail, reminders} = do
+    invoices <- filter (\(_, Invoice {isPaid}) -> not isPaid) <$> readInvoices csvPath options
     forM_ invoices $ \invoice@(address, _) -> do
-        sendEmail sendmail $ uncurry (renderEmail [email]) invoice
+        sendEmail sendmail $ uncurry (renderEmail reminders [email]) invoice
         putStr "Lähetetty osoitteeseen: "
         T.putStrLn $ decodeUtf8 $ renderAddresses address
         threadDelay (3 * 1000 * 1000)
@@ -46,9 +46,9 @@ updateTableMain invoiceCsv transactionCsv = do
     LBS.writeFile invoiceCsv $ encodeByName headers newInvoices
 
 updateInvoices :: [CsvTransaction] -> CsvInvoice -> CsvInvoice
-updateInvoices transactions invoice@CsvInvoice {isPaid, reference}
+updateInvoices transactions invoice@CsvInvoice {isPaid, reference, ..}
   | isPaid = invoice 
-  | otherwise = invoice {isPaid = reference `elem` transactionReferences}
+  | otherwise = CsvInvoice {isPaid = reference `elem` transactionReferences, ..}
       where transactionReferences = catMaybes $ transactionReference <$> transactions
             transactionReference CsvTransaction {referenceOrMessage = Message _} = Nothing
             transactionReference CsvTransaction {referenceOrMessage = Reference ref} = Just ref
diff --git a/src/Laskutin/Email.hs b/src/Laskutin/Email.hs
index e5eeb9f..6122778 100644
--- a/src/Laskutin/Email.hs
+++ b/src/Laskutin/Email.hs
@@ -19,12 +19,12 @@ import qualified Data.ByteString.Lazy as LBS
 
 import Laskutin.Types
 
-renderEmail :: [Address] -> [Address] -> Invoice -> ByteString
-renderEmail senders recipients = renderMessage
+renderEmail :: Bool -> [Address] -> [Address] -> Invoice -> ByteString
+renderEmail isReminder senders recipients = renderMessage
     . set (headerBCC defaultCharsets) senders
     . set (headerTo defaultCharsets) recipients
     . set (headerFrom defaultCharsets) senders
-    . invoiceEmail
+    . invoiceEmail isReminder
 
 sendEmail :: FilePath -> ByteString -> IO ()
 sendEmail sendmail email = do
@@ -36,10 +36,11 @@ sendEmail sendmail email = do
       ExitSuccess -> pure ()
       ExitFailure code -> throwIO $ ErrorCall ("sendmail exited with error code " <> show code)
 
-invoiceEmail :: Invoice -> MIMEMessage
-invoiceEmail Invoice {rows, reference, account, recipient, due, subject, message} =
-    set (headerSubject defaultCharsets) (Just $ "Lasku – " <> subject ) $ createTextPlainMessage $
-        (if T.null message then mempty else (message <> "\n\n\n"))
+invoiceEmail :: Bool -> Invoice -> MIMEMessage
+invoiceEmail isReminder Invoice {rows, reference, account, recipient, due, subject, message} =
+    set (headerSubject defaultCharsets) (Just $ subjectPrefix <> " – " <> subject ) $ createTextPlainMessage $
+        (if isReminder then "Muistutus alla olevan laskun maksamisesta. Jos olet juuri maksanut kyseisen laskun, tämä muistutus on aiheeton.\n\n" else mempty)
+        <> (if T.null message then mempty else (message <> "\n\n\n"))
         <> sconcat (NE.map renderInvoiceRow rows) <> "\n"
         <> renderInvoiceRow InvoiceRow {name = "YHTEENSÄ", amount = 1, price = sum $ invoiceRowSum <$> rows} <> "\n"
         <> "Maksu tilisiirrolla\n\n"
@@ -49,6 +50,7 @@ invoiceEmail Invoice {rows, reference, account, recipient, due, subject, message
         <> maybe mempty (("Eräpäivä: " <>) . renderDay) due
             where renderDay (YearMonthDay year month day) =
                       T.pack $ show day <> "." <> show month <> "." <> show year
+                  subjectPrefix = if isReminder then "Maksumuistutus" else "Lasku"
 
 invoiceRowSum :: InvoiceRow -> Euro
 invoiceRowSum InvoiceRow {amount, price} = fromIntegral amount * price
diff --git a/src/Laskutin/Options.hs b/src/Laskutin/Options.hs
index 1626cc5..9ee8256 100644
--- a/src/Laskutin/Options.hs
+++ b/src/Laskutin/Options.hs
@@ -30,6 +30,7 @@ data SendOptions = SendOptions
     , due :: Maybe Day
     , email :: Address
     , sendmail :: FilePath
+    , reminders :: Bool
     }
 
 parseOptions :: IO Options
@@ -56,3 +57,4 @@ sendOptions = fmap Send $ SendOptions
     <*> option (eitherReader $ parse (address defaultCharsets) . T.encodeUtf8 . T.pack)
         (long "email" <> help "Invoice sender email address" <> metavar "EMAIL")
     <*> strOption (long "sendmail" <> short 'm' <> metavar "FILE" <> help "The sendmail program to use")
+    <*> switch (long "reminders" <> short 'r' <> help "Send reminder emails")
diff --git a/src/Laskutin/Types.hs b/src/Laskutin/Types.hs
index 449d53f..c9373ce 100644
--- a/src/Laskutin/Types.hs
+++ b/src/Laskutin/Types.hs
@@ -44,6 +44,7 @@ data Invoice = Invoice
     , subject :: Text
     , message :: Text
     , due :: Maybe Day
+    , isPaid :: Bool
     } deriving (Show, Eq)
 
 data Reference = Reference {base :: [Digit], checksum :: Digit}