diff --git a/src/App/Page/Zone.purs b/src/App/Page/Zone.purs
index b03389d..6040f09 100644
--- a/src/App/Page/Zone.purs
+++ b/src/App/Page/Zone.purs
@@ -188,6 +188,9 @@ data Action
   -- | Change the temporary report size limit for DMARC.
   | DMARC_mail_limit String
 
+  -- | Change the requested report interval.
+  | DMARC_ri String
+
   -- | Add a new mail address to the DMARC rua list.
   | DMARC_rua_Add
 
@@ -261,6 +264,7 @@ type State =
 
   , dmarc_mail :: String
   , dmarc_mail_limit :: Maybe Int
+  , dmarc_ri :: Maybe Int
 
   , dkim :: DKIM.DKIM
   , dmarc :: DMARC.DMARC
@@ -321,6 +325,7 @@ initialState domain =
 
   , dmarc_mail: ""
   , dmarc_mail_limit: Nothing
+  , dmarc_ri: Nothing
 
   , current_tab: Zone
   }
@@ -559,14 +564,23 @@ render state
 
           , Bulma.hr
           , Bulma.selection_field "idDMARCfo" "When to send a report" DMARC_fo DMARC.report_occasions_txt (maybe "-" show state.dmarc.fo)
+
+          , Bulma.hr
+          , Bulma.div_content [Bulma.explanation Explanations.dmarc_contact]
+          , maybe (Bulma.p "There is no address to send aggregated reports to.")
+            (display_dmarc_mail_addresses "Addresses to contact for aggregated reports" DMARC_remove_rua) current_ruas
+          , maybe (Bulma.p "There is no address to send detailed reports to.")
+            (display_dmarc_mail_addresses "Addresses to contact for detailed reports" DMARC_remove_ruf) current_rufs
+
           , Bulma.hr
-          , maybe (Bulma.p "There is no address to send aggragated reports to.") (display_dmarc_mail_addresses DMARC_remove_rua) current_ruas
-          , maybe (Bulma.p "There is no address to send detailed reports to.") (display_dmarc_mail_addresses DMARC_remove_ruf) current_rufs
           , Bulma.box_input "idDMARCmail"      "Address to contact" "admin@example.com" DMARC_mail state.dmarc_mail
           , Bulma.box_input "idDMARCmaillimit" "Report size limit (in KB)" "2000" DMARC_mail_limit (maybe "0" show state.dmarc_mail_limit)
           , Bulma.level [ Bulma.btn "New address for aggregated report" DMARC_rua_Add
                         , Bulma.btn "New address for specific report" DMARC_ruf_Add
                         ] []
+
+          , Bulma.hr
+          , Bulma.box_input "idDMARCri" "Report interval (in seconds)" "86400" DMARC_ri (maybe "0" show state.dmarc_ri)
           ]
 
         current_ruas = case state._currentRR.dmarc of
@@ -742,6 +756,7 @@ handleAction = case _ of
                 , spf_modifier_v = ""
                 , dmarc_mail = ""
                 , dmarc_mail_limit = Nothing
+                , dmarc_ri = Nothing
                 }
 
   SaveRR rr -> do
@@ -829,6 +844,7 @@ handleAction = case _ of
 
   DMARC_mail v -> H.modify_ _ { dmarc_mail = v }
   DMARC_mail_limit v -> H.modify_ _ { dmarc_mail_limit = Just $ fromMaybe 0 $ fromString v }
+  DMARC_ri v -> H.modify_ _ { dmarc_ri = fromString v }
   DMARC_rua_Add -> do
     state <- H.get
     let current_ruas = case state._currentRR.dmarc of
@@ -1124,10 +1140,11 @@ display_modifiers ms =
     , HH.td_ [ Bulma.alert_btn "x" (SPF_remove_modifier i) ]
     ]
 
-display_dmarc_mail_addresses :: forall w. (Int -> Action) -> Array DMARC.DMARCURI -> HH.HTML w Action
-display_dmarc_mail_addresses f ms =
+display_dmarc_mail_addresses :: forall w. String -> (Int -> Action) -> Array DMARC.DMARCURI -> HH.HTML w Action
+display_dmarc_mail_addresses t f ms =
   Bulma.box_ C.has_background_warning_light
-    [ Bulma.table [] [ Bulma.dmarc_dmarcuri_table_header, HH.tbody_ $ map render_dmarcuri_row $ attach_id 0 ms] ]
+    [ Bulma.h3 t
+    , Bulma.table [] [ Bulma.dmarc_dmarcuri_table_header, HH.tbody_ $ map render_dmarcuri_row $ attach_id 0 ms] ]
   where
   render_dmarcuri_row :: (Tuple Int DMARC.DMARCURI) -> HH.HTML w Action
   render_dmarcuri_row (Tuple i m) = HH.tr_
diff --git a/src/App/Text/Explanations.purs b/src/App/Text/Explanations.purs
index 415a253..c63b088 100644
--- a/src/App/Text/Explanations.purs
+++ b/src/App/Text/Explanations.purs
@@ -227,6 +227,12 @@ dmarc_aspf =
     ]
   ]
 
+dmarc_contact :: forall w i. Array (HH.HTML w i)
+dmarc_contact =
+  [ Bulma.p """
+    In case you want to receive error reports, enter email addresses that should receive either an aggregated report or a detailed report of the occurring errors.
+    """
+  ]
 
 dkim_default_algorithms :: forall w i. Array (HH.HTML w i)
 dkim_default_algorithms =
diff --git a/src/App/Type/DMARC.purs b/src/App/Type/DMARC.purs
index 6c7b482..8360ab5 100644
--- a/src/App/Type/DMARC.purs
+++ b/src/App/Type/DMARC.purs
@@ -41,7 +41,6 @@ type DMARC
     , fo :: Maybe ReportOccasion
 
     -- | rua= Optional. Addresses to which aggregate feedback is to be sent.
-    -- | **TODO**: A size limit can be provided (in KB).
     , rua :: Maybe (Array DMARCURI)
 
     -- | ruf= Optional. Addresses to which message-specific failure information is to be reported.