diff --git a/src/App/Container.purs b/src/App/Container.purs
index 17f68b1..6152fd3 100644
--- a/src/App/Container.purs
+++ b/src/App/Container.purs
@@ -545,6 +545,11 @@ handleAction = case _ of
             handleAction $ Log $ ErrorLog "TODO: received a GotPermissionCheck message."
           (AuthD.GotPermissionSet _) -> do
             handleAction $ Log $ ErrorLog "Received a GotPermissionSet message."
+          (AuthD.GotErrorEmailAddressNotValidated _) -> do
+            handleAction $ Log $ ErrorLog """
+                Cannot authenticate: your email address hasn't been validated.
+                Please check your email inbox.
+                """
           m@(AuthD.GotPasswordRecovered _) -> do
             handleAction $ Log $ SuccessLog "your new password is now valid."
             handleAction $ DispatchAuthDaemonMessage m
diff --git a/src/App/Message/AuthenticationDaemon.purs b/src/App/Message/AuthenticationDaemon.purs
index e00e9cc..f689633 100644
--- a/src/App/Message/AuthenticationDaemon.purs
+++ b/src/App/Message/AuthenticationDaemon.purs
@@ -344,6 +344,11 @@ type ErrorPasswordTooLong = {}
 codecGotErrorPasswordTooLong :: CA.JsonCodec ErrorPasswordTooLong
 codecGotErrorPasswordTooLong = CA.object "ErrorPasswordTooLong" (CAR.record {})
 
+{- 36 -}
+type ErrorEmailAddressNotValidated = {}
+codecGotErrorEmailAddressNotValidated :: CA.JsonCodec ErrorEmailAddressNotValidated
+codecGotErrorEmailAddressNotValidated = CA.object "ErrorEmailAddressNotValidated" (CAR.record {})
+
 {- 250 -}
 -- type KeepAlive = { }
 codecGotKeepAlive ∷ CA.JsonCodec KeepAlive
@@ -370,36 +375,37 @@ data RequestMessage
 
 -- All possible answers from the authentication daemon (authd).
 data AnswerMessage
-  = GotError                     Error                     -- 0
-  | GotToken                     Logged                    -- 1
-  | GotUser                      User                      -- 2
-  | GotUserAdded                 UserAdded                 -- 3
-  | GotUserEdited                UserEdited                -- 4
-  | GotUserValidated             UserValidated             -- 5
-  | GotUsersList                 UsersList                 -- 6
-  | GotPermissionCheck           PermissionCheck           -- 7
-  | GotPermissionSet             PermissionSet             -- 8
-  | GotPasswordRecoverySent      PasswordRecoverySent      -- 9
-  | GotPasswordRecovered         PasswordRecovered         -- 10
-  | GotMatchingUsers             MatchingUsers             -- 11
-  | GotUserDeleted               UserDeleted               -- 12
-  | GotErrorMustBeAuthenticated  ErrorMustBeAuthenticated  -- 20
-  | GotErrorAlreadyUsedLogin     ErrorAlreadyUsedLogin     -- 21
-  | GotErrorMailRequired         ErrorMailRequired         -- 22
-  | GotErrorUserNotFound         ErrorUserNotFound         -- 23
-  | GotErrorPasswordTooShort     ErrorPasswordTooShort     -- 24
-  | GotErrorInvalidCredentials   ErrorInvalidCredentials   -- 25
-  | GotErrorRegistrationsClosed  ErrorRegistrationsClosed  -- 26
-  | GotErrorInvalidLoginFormat   ErrorInvalidLoginFormat   -- 27
-  | GotErrorInvalidEmailFormat   ErrorInvalidEmailFormat   -- 28
-  | GotErrorAlreadyUsersInDB     ErrorAlreadyUsersInDB     -- 29
-  | GotErrorReadOnlyProfileKeys  ErrorReadOnlyProfileKeys  -- 30
-  | GotErrorInvalidActivationKey ErrorInvalidActivationKey -- 31
-  | GotErrorUserAlreadyValidated ErrorUserAlreadyValidated -- 32
-  | GotErrorCannotContactUser    ErrorCannotContactUser    -- 33
-  | GotErrorInvalidRenewKey      ErrorInvalidRenewKey      -- 34
-  | GotErrorPasswordTooLong      ErrorPasswordTooLong      -- 35
-  | GotKeepAlive                 KeepAlive                 -- 250
+  = GotError                         Error                         -- 0
+  | GotToken                         Logged                        -- 1
+  | GotUser                          User                          -- 2
+  | GotUserAdded                     UserAdded                     -- 3
+  | GotUserEdited                    UserEdited                    -- 4
+  | GotUserValidated                 UserValidated                 -- 5
+  | GotUsersList                     UsersList                     -- 6
+  | GotPermissionCheck               PermissionCheck               -- 7
+  | GotPermissionSet                 PermissionSet                 -- 8
+  | GotPasswordRecoverySent          PasswordRecoverySent          -- 9
+  | GotPasswordRecovered             PasswordRecovered             -- 10
+  | GotMatchingUsers                 MatchingUsers                 -- 11
+  | GotUserDeleted                   UserDeleted                   -- 12
+  | GotErrorMustBeAuthenticated      ErrorMustBeAuthenticated      -- 20
+  | GotErrorAlreadyUsedLogin         ErrorAlreadyUsedLogin         -- 21
+  | GotErrorMailRequired             ErrorMailRequired             -- 22
+  | GotErrorUserNotFound             ErrorUserNotFound             -- 23
+  | GotErrorPasswordTooShort         ErrorPasswordTooShort         -- 24
+  | GotErrorInvalidCredentials       ErrorInvalidCredentials       -- 25
+  | GotErrorRegistrationsClosed      ErrorRegistrationsClosed      -- 26
+  | GotErrorInvalidLoginFormat       ErrorInvalidLoginFormat       -- 27
+  | GotErrorInvalidEmailFormat       ErrorInvalidEmailFormat       -- 28
+  | GotErrorAlreadyUsersInDB         ErrorAlreadyUsersInDB         -- 29
+  | GotErrorReadOnlyProfileKeys      ErrorReadOnlyProfileKeys      -- 30
+  | GotErrorInvalidActivationKey     ErrorInvalidActivationKey     -- 31
+  | GotErrorUserAlreadyValidated     ErrorUserAlreadyValidated     -- 32
+  | GotErrorCannotContactUser        ErrorCannotContactUser        -- 33
+  | GotErrorInvalidRenewKey          ErrorInvalidRenewKey          -- 34
+  | GotErrorPasswordTooLong          ErrorPasswordTooLong          -- 35
+  | GotErrorEmailAddressNotValidated ErrorEmailAddressNotValidated -- 36
+  | GotKeepAlive                     KeepAlive                     -- 250
 
 encode ∷ RequestMessage -> Tuple UInt String
 encode m = case m of
@@ -433,36 +439,37 @@ data DecodeError
 decode :: Int -> String -> Either DecodeError AnswerMessage
 decode number string
   = case number of
-    0   -> error_management codecGotError                     GotError
-    1   -> error_management codecGotToken                     GotToken
-    2   -> error_management codecGotUser                      GotUser
-    3   -> error_management codecGotUserAdded                 GotUserAdded
-    4   -> error_management codecGotUserEdited                GotUserEdited
-    5   -> error_management codecGotUserValidated             GotUserValidated
-    6   -> error_management codecGotUsersList                 GotUsersList
-    7   -> error_management codecGotPermissionCheck           GotPermissionCheck
-    8   -> error_management codecGotPermissionSet             GotPermissionSet
-    9   -> error_management codecGotPasswordRecoverySent      GotPasswordRecoverySent
-    10  -> error_management codecGotPasswordRecovered         GotPasswordRecovered
-    11  -> error_management codecGotMatchingUsers             GotMatchingUsers
-    12  -> error_management codecGotUserDeleted               GotUserDeleted
-    20  -> error_management codecGotErrorMustBeAuthenticated  GotErrorMustBeAuthenticated
-    21  -> error_management codecGotErrorAlreadyUsedLogin     GotErrorAlreadyUsedLogin
-    22  -> error_management codecGotErrorMailRequired         GotErrorMailRequired
-    23  -> error_management codecGotErrorUserNotFound         GotErrorUserNotFound
-    24  -> error_management codecGotErrorPasswordTooShort     GotErrorPasswordTooShort
-    25  -> error_management codecGotErrorInvalidCredentials   GotErrorInvalidCredentials
-    26  -> error_management codecGotErrorRegistrationsClosed  GotErrorRegistrationsClosed
-    27  -> error_management codecGotErrorInvalidLoginFormat   GotErrorInvalidLoginFormat
-    28  -> error_management codecGotErrorInvalidEmailFormat   GotErrorInvalidEmailFormat
-    29  -> error_management codecGotErrorAlreadyUsersInDB     GotErrorAlreadyUsersInDB
-    30  -> error_management codecGotErrorReadOnlyProfileKeys  GotErrorReadOnlyProfileKeys
-    31  -> error_management codecGotErrorInvalidActivationKey GotErrorInvalidActivationKey
-    32  -> error_management codecGotErrorUserAlreadyValidated GotErrorUserAlreadyValidated
-    33  -> error_management codecGotErrorCannotContactUser    GotErrorCannotContactUser
-    34  -> error_management codecGotErrorInvalidRenewKey      GotErrorInvalidRenewKey
-    35  -> error_management codecGotErrorPasswordTooLong      GotErrorPasswordTooLong
-    250 -> error_management codecGotKeepAlive                 GotKeepAlive
+    0   -> error_management codecGotError                         GotError
+    1   -> error_management codecGotToken                         GotToken
+    2   -> error_management codecGotUser                          GotUser
+    3   -> error_management codecGotUserAdded                     GotUserAdded
+    4   -> error_management codecGotUserEdited                    GotUserEdited
+    5   -> error_management codecGotUserValidated                 GotUserValidated
+    6   -> error_management codecGotUsersList                     GotUsersList
+    7   -> error_management codecGotPermissionCheck               GotPermissionCheck
+    8   -> error_management codecGotPermissionSet                 GotPermissionSet
+    9   -> error_management codecGotPasswordRecoverySent          GotPasswordRecoverySent
+    10  -> error_management codecGotPasswordRecovered             GotPasswordRecovered
+    11  -> error_management codecGotMatchingUsers                 GotMatchingUsers
+    12  -> error_management codecGotUserDeleted                   GotUserDeleted
+    20  -> error_management codecGotErrorMustBeAuthenticated      GotErrorMustBeAuthenticated
+    21  -> error_management codecGotErrorAlreadyUsedLogin         GotErrorAlreadyUsedLogin
+    22  -> error_management codecGotErrorMailRequired             GotErrorMailRequired
+    23  -> error_management codecGotErrorUserNotFound             GotErrorUserNotFound
+    24  -> error_management codecGotErrorPasswordTooShort         GotErrorPasswordTooShort
+    25  -> error_management codecGotErrorInvalidCredentials       GotErrorInvalidCredentials
+    26  -> error_management codecGotErrorRegistrationsClosed      GotErrorRegistrationsClosed
+    27  -> error_management codecGotErrorInvalidLoginFormat       GotErrorInvalidLoginFormat
+    28  -> error_management codecGotErrorInvalidEmailFormat       GotErrorInvalidEmailFormat
+    29  -> error_management codecGotErrorAlreadyUsersInDB         GotErrorAlreadyUsersInDB
+    30  -> error_management codecGotErrorReadOnlyProfileKeys      GotErrorReadOnlyProfileKeys
+    31  -> error_management codecGotErrorInvalidActivationKey     GotErrorInvalidActivationKey
+    32  -> error_management codecGotErrorUserAlreadyValidated     GotErrorUserAlreadyValidated
+    33  -> error_management codecGotErrorCannotContactUser        GotErrorCannotContactUser
+    34  -> error_management codecGotErrorInvalidRenewKey          GotErrorInvalidRenewKey
+    35  -> error_management codecGotErrorPasswordTooLong          GotErrorPasswordTooLong
+    36  -> error_management codecGotErrorEmailAddressNotValidated GotErrorEmailAddressNotValidated
+    250 -> error_management codecGotKeepAlive                     GotKeepAlive
     _  -> Left UnknownNumber
   where
     -- Signature is required since the compiler's guess is wrong.