diff --git a/.idea/misc.xml b/.idea/misc.xml
index caad359b..77d47004 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -30,7 +30,7 @@
       </value>
     </option>
   </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_7" project-jdk-name="1.8" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" project-jdk-name="1.8" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/build/classes" />
   </component>
   <component name="ProjectType">
diff --git a/app/src/main/java/eu/faircode/email/FragmentCompose.java b/app/src/main/java/eu/faircode/email/FragmentCompose.java
index 9a01d54f..b84c6359 100644
--- a/app/src/main/java/eu/faircode/email/FragmentCompose.java
+++ b/app/src/main/java/eu/faircode/email/FragmentCompose.java
@@ -1011,6 +1011,9 @@ public class FragmentCompose extends FragmentEx {
                         if (openPgpConnection == null || !openPgpConnection.isBound())
                             throw new IllegalArgumentException(getString(R.string.title_no_openpgp));
 
+                        if (ato.length != 1)
+                            throw new IllegalArgumentException(context.getString(R.string.title_to_one));
+
                         Intent data = new Intent();
                         data.setAction(OpenPgpApi.ACTION_ENCRYPT);
                         data.putExtra(OpenPgpApi.EXTRA_USER_IDS, new String[]{ato[0].getAddress()});
diff --git a/app/src/main/res/values-af/strings.xml b/app/src/main/res/values-af/strings.xml
index 71f6f61e..5b63fc95 100644
--- a/app/src/main/res/values-af/strings.xml
+++ b/app/src/main/res/values-af/strings.xml
@@ -146,6 +146,7 @@
   <string name="title_decrypt">Decrypt</string>
   <string name="title_from_missing">Sender missing</string>
   <string name="title_to_missing">Recipient missing</string>
+  <string name="title_to_one">One recipient expected</string>
   <string name="title_attachments_missing">Attachments still loading</string>
   <string name="title_draft_trashed">Draft trashed</string>
   <string name="title_draft_saved">Draft saved</string>
diff --git a/app/src/main/res/values-ar-rBH/strings.xml b/app/src/main/res/values-ar-rBH/strings.xml
index cc10098b..a6efddd3 100644
--- a/app/src/main/res/values-ar-rBH/strings.xml
+++ b/app/src/main/res/values-ar-rBH/strings.xml
@@ -162,6 +162,7 @@
   <string name="title_decrypt">Decrypt</string>
   <string name="title_from_missing">Sender missing</string>
   <string name="title_to_missing">Recipient missing</string>
+  <string name="title_to_one">One recipient expected</string>
   <string name="title_attachments_missing">Attachments still loading</string>
   <string name="title_draft_trashed">Draft trashed</string>
   <string name="title_draft_saved">Draft saved</string>
diff --git a/app/src/main/res/values-ar-rEG/strings.xml b/app/src/main/res/values-ar-rEG/strings.xml
index cc10098b..a6efddd3 100644
--- a/app/src/main/res/values-ar-rEG/strings.xml
+++ b/app/src/main/res/values-ar-rEG/strings.xml
@@ -162,6 +162,7 @@
   <string name="title_decrypt">Decrypt</string>
   <string name="title_from_missing">Sender missing</string>
   <string name="title_to_missing">Recipient missing</string>
+  <string name="title_to_one">One recipient expected</string>
   <string name="title_attachments_missing">Attachments still loading</string>
   <string name="title_draft_trashed">Draft trashed</string>
   <string name="title_draft_saved">Draft saved</string>
diff --git a/app/src/main/res/values-ar-rSA/strings.xml b/app/src/main/res/values-ar-rSA/strings.xml
index cc10098b..a6efddd3 100644
--- a/app/src/main/res/values-ar-rSA/strings.xml
+++ b/app/src/main/res/values-ar-rSA/strings.xml
@@ -162,6 +162,7 @@
   <string name="title_decrypt">Decrypt</string>
   <string name="title_from_missing">Sender missing</string>
   <string name="title_to_missing">Recipient missing</string>
+  <string name="title_to_one">One recipient expected</string>
   <string name="title_attachments_missing">Attachments still loading</string>
   <string name="title_draft_trashed">Draft trashed</string>
   <string name="title_draft_saved">Draft saved</string>
diff --git a/app/src/main/res/values-ar-rYE/strings.xml b/app/src/main/res/values-ar-rYE/strings.xml
index cc10098b..a6efddd3 100644
--- a/app/src/main/res/values-ar-rYE/strings.xml
+++ b/app/src/main/res/values-ar-rYE/strings.xml
@@ -162,6 +162,7 @@
   <string name="title_decrypt">Decrypt</string>
   <string name="title_from_missing">Sender missing</string>
   <string name="title_to_missing">Recipient missing</string>
+  <string name="title_to_one">One recipient expected</string>
   <string name="title_attachments_missing">Attachments still loading</string>
   <string name="title_draft_trashed">Draft trashed</string>
   <string name="title_draft_saved">Draft saved</string>
diff --git a/app/src/main/res/values-ar/strings.xml b/app/src/main/res/values-ar/strings.xml
index cc10098b..a6efddd3 100644
--- a/app/src/main/res/values-ar/strings.xml
+++ b/app/src/main/res/values-ar/strings.xml
@@ -162,6 +162,7 @@
   <string name="title_decrypt">Decrypt</string>
   <string name="title_from_missing">Sender missing</string>
   <string name="title_to_missing">Recipient missing</string>
+  <string name="title_to_one">One recipient expected</string>
   <string name="title_attachments_missing">Attachments still loading</string>
   <string name="title_draft_trashed">Draft trashed</string>
   <string name="title_draft_saved">Draft saved</string>
diff --git a/app/src/main/res/values-ca/strings.xml b/app/src/main/res/values-ca/strings.xml
index 71f6f61e..5b63fc95 100644
--- a/app/src/main/res/values-ca/strings.xml
+++ b/app/src/main/res/values-ca/strings.xml
@@ -146,6 +146,7 @@
   <string name="title_decrypt">Decrypt</string>
   <string name="title_from_missing">Sender missing</string>
   <string name="title_to_missing">Recipient missing</string>
+  <string name="title_to_one">One recipient expected</string>
   <string name="title_attachments_missing">Attachments still loading</string>
   <string name="title_draft_trashed">Draft trashed</string>
   <string name="title_draft_saved">Draft saved</string>
diff --git a/app/src/main/res/values-cs/strings.xml b/app/src/main/res/values-cs/strings.xml
index 2476bb8e..e924d4a2 100644
--- a/app/src/main/res/values-cs/strings.xml
+++ b/app/src/main/res/values-cs/strings.xml
@@ -154,6 +154,7 @@
   <string name="title_decrypt">Decrypt</string>
   <string name="title_from_missing">Sender missing</string>
   <string name="title_to_missing">Recipient missing</string>
+  <string name="title_to_one">One recipient expected</string>
   <string name="title_attachments_missing">Attachments still loading</string>
   <string name="title_draft_trashed">Draft trashed</string>
   <string name="title_draft_saved">Draft saved</string>
diff --git a/app/src/main/res/values-da/strings.xml b/app/src/main/res/values-da/strings.xml
index d819be34..30e1a98c 100644
--- a/app/src/main/res/values-da/strings.xml
+++ b/app/src/main/res/values-da/strings.xml
@@ -146,6 +146,7 @@
   <string name="title_decrypt">Dekryptér</string>
   <string name="title_from_missing">Afsender mangler</string>
   <string name="title_to_missing">Modtager mangler</string>
+  <string name="title_to_one">One recipient expected</string>
   <string name="title_attachments_missing">Vedhæftede filer indlæses stadig</string>
   <string name="title_draft_trashed">Kladde slettet</string>
   <string name="title_draft_saved">Kladde gemt</string>
diff --git a/app/src/main/res/values-de/strings.xml b/app/src/main/res/values-de/strings.xml
index 7c7b78ee..16e8743d 100644
--- a/app/src/main/res/values-de/strings.xml
+++ b/app/src/main/res/values-de/strings.xml
@@ -146,6 +146,7 @@
   <string name="title_decrypt">Entschlüsseln</string>
   <string name="title_from_missing">Absender fehlt</string>
   <string name="title_to_missing">Empfänger fehlt</string>
+  <string name="title_to_one">One recipient expected</string>
   <string name="title_attachments_missing">Anhänge werden noch geladen</string>
   <string name="title_draft_trashed">Entwurf gelöscht</string>
   <string name="title_draft_saved">Entwurf gespeichert</string>
diff --git a/app/src/main/res/values-el/strings.xml b/app/src/main/res/values-el/strings.xml
index 71f6f61e..5b63fc95 100644
--- a/app/src/main/res/values-el/strings.xml
+++ b/app/src/main/res/values-el/strings.xml
@@ -146,6 +146,7 @@
   <string name="title_decrypt">Decrypt</string>
   <string name="title_from_missing">Sender missing</string>
   <string name="title_to_missing">Recipient missing</string>
+  <string name="title_to_one">One recipient expected</string>
   <string name="title_attachments_missing">Attachments still loading</string>
   <string name="title_draft_trashed">Draft trashed</string>
   <string name="title_draft_saved">Draft saved</string>
diff --git a/app/src/main/res/values-en/strings.xml b/app/src/main/res/values-en/strings.xml
index 71f6f61e..5b63fc95 100644
--- a/app/src/main/res/values-en/strings.xml
+++ b/app/src/main/res/values-en/strings.xml
@@ -146,6 +146,7 @@
   <string name="title_decrypt">Decrypt</string>
   <string name="title_from_missing">Sender missing</string>
   <string name="title_to_missing">Recipient missing</string>
+  <string name="title_to_one">One recipient expected</string>
   <string name="title_attachments_missing">Attachments still loading</string>
   <string name="title_draft_trashed">Draft trashed</string>
   <string name="title_draft_saved">Draft saved</string>
diff --git a/app/src/main/res/values-es-rES/strings.xml b/app/src/main/res/values-es-rES/strings.xml
index 71f6f61e..5b63fc95 100644
--- a/app/src/main/res/values-es-rES/strings.xml
+++ b/app/src/main/res/values-es-rES/strings.xml
@@ -146,6 +146,7 @@
   <string name="title_decrypt">Decrypt</string>
   <string name="title_from_missing">Sender missing</string>
   <string name="title_to_missing">Recipient missing</string>
+  <string name="title_to_one">One recipient expected</string>
   <string name="title_attachments_missing">Attachments still loading</string>
   <string name="title_draft_trashed">Draft trashed</string>
   <string name="title_draft_saved">Draft saved</string>
diff --git a/app/src/main/res/values-fi/strings.xml b/app/src/main/res/values-fi/strings.xml
index 71f6f61e..5b63fc95 100644
--- a/app/src/main/res/values-fi/strings.xml
+++ b/app/src/main/res/values-fi/strings.xml
@@ -146,6 +146,7 @@
   <string name="title_decrypt">Decrypt</string>
   <string name="title_from_missing">Sender missing</string>
   <string name="title_to_missing">Recipient missing</string>
+  <string name="title_to_one">One recipient expected</string>
   <string name="title_attachments_missing">Attachments still loading</string>
   <string name="title_draft_trashed">Draft trashed</string>
   <string name="title_draft_saved">Draft saved</string>
diff --git a/app/src/main/res/values-fr/strings.xml b/app/src/main/res/values-fr/strings.xml
index 3302c2cc..7ac25a95 100644
--- a/app/src/main/res/values-fr/strings.xml
+++ b/app/src/main/res/values-fr/strings.xml
@@ -146,6 +146,7 @@
   <string name="title_decrypt">Déchiffrer</string>
   <string name="title_from_missing">Expéditeur manquant</string>
   <string name="title_to_missing">Destinataire manquant</string>
+  <string name="title_to_one">One recipient expected</string>
   <string name="title_attachments_missing">Pièces jointes en cours de chargement</string>
   <string name="title_draft_trashed">Brouillon supprimé</string>
   <string name="title_draft_saved">Brouillon enregistré</string>
diff --git a/app/src/main/res/values-he/strings.xml b/app/src/main/res/values-he/strings.xml
index 1a150a33..aa72ad14 100644
--- a/app/src/main/res/values-he/strings.xml
+++ b/app/src/main/res/values-he/strings.xml
@@ -154,6 +154,7 @@
   <string name="title_decrypt">Decrypt</string>
   <string name="title_from_missing">Sender missing</string>
   <string name="title_to_missing">Recipient missing</string>
+  <string name="title_to_one">One recipient expected</string>
   <string name="title_attachments_missing">Attachments still loading</string>
   <string name="title_draft_trashed">Draft trashed</string>
   <string name="title_draft_saved">Draft saved</string>
diff --git a/app/src/main/res/values-hu/strings.xml b/app/src/main/res/values-hu/strings.xml
index 71f6f61e..5b63fc95 100644
--- a/app/src/main/res/values-hu/strings.xml
+++ b/app/src/main/res/values-hu/strings.xml
@@ -146,6 +146,7 @@
   <string name="title_decrypt">Decrypt</string>
   <string name="title_from_missing">Sender missing</string>
   <string name="title_to_missing">Recipient missing</string>
+  <string name="title_to_one">One recipient expected</string>
   <string name="title_attachments_missing">Attachments still loading</string>
   <string name="title_draft_trashed">Draft trashed</string>
   <string name="title_draft_saved">Draft saved</string>
diff --git a/app/src/main/res/values-it/strings.xml b/app/src/main/res/values-it/strings.xml
index 09fe1f94..7457a3bd 100644
--- a/app/src/main/res/values-it/strings.xml
+++ b/app/src/main/res/values-it/strings.xml
@@ -146,6 +146,7 @@
   <string name="title_decrypt">Decrypt</string>
   <string name="title_from_missing">Mittente mancante</string>
   <string name="title_to_missing">Destinatario mancante</string>
+  <string name="title_to_one">One recipient expected</string>
   <string name="title_attachments_missing">Allegati ancora in fase di caricamento</string>
   <string name="title_draft_trashed">Bozza cestinata</string>
   <string name="title_draft_saved">Bozza salvata</string>
diff --git a/app/src/main/res/values-iw/strings.xml b/app/src/main/res/values-iw/strings.xml
index 1a150a33..aa72ad14 100644
--- a/app/src/main/res/values-iw/strings.xml
+++ b/app/src/main/res/values-iw/strings.xml
@@ -154,6 +154,7 @@
   <string name="title_decrypt">Decrypt</string>
   <string name="title_from_missing">Sender missing</string>
   <string name="title_to_missing">Recipient missing</string>
+  <string name="title_to_one">One recipient expected</string>
   <string name="title_attachments_missing">Attachments still loading</string>
   <string name="title_draft_trashed">Draft trashed</string>
   <string name="title_draft_saved">Draft saved</string>
diff --git a/app/src/main/res/values-ja/strings.xml b/app/src/main/res/values-ja/strings.xml
index 0cea958a..d94ccd08 100644
--- a/app/src/main/res/values-ja/strings.xml
+++ b/app/src/main/res/values-ja/strings.xml
@@ -142,6 +142,7 @@
   <string name="title_decrypt">Decrypt</string>
   <string name="title_from_missing">Sender missing</string>
   <string name="title_to_missing">Recipient missing</string>
+  <string name="title_to_one">One recipient expected</string>
   <string name="title_attachments_missing">Attachments still loading</string>
   <string name="title_draft_trashed">Draft trashed</string>
   <string name="title_draft_saved">Draft saved</string>
diff --git a/app/src/main/res/values-ko/strings.xml b/app/src/main/res/values-ko/strings.xml
index 0cea958a..d94ccd08 100644
--- a/app/src/main/res/values-ko/strings.xml
+++ b/app/src/main/res/values-ko/strings.xml
@@ -142,6 +142,7 @@
   <string name="title_decrypt">Decrypt</string>
   <string name="title_from_missing">Sender missing</string>
   <string name="title_to_missing">Recipient missing</string>
+  <string name="title_to_one">One recipient expected</string>
   <string name="title_attachments_missing">Attachments still loading</string>
   <string name="title_draft_trashed">Draft trashed</string>
   <string name="title_draft_saved">Draft saved</string>
diff --git a/app/src/main/res/values-nb/strings.xml b/app/src/main/res/values-nb/strings.xml
index 71f6f61e..5b63fc95 100644
--- a/app/src/main/res/values-nb/strings.xml
+++ b/app/src/main/res/values-nb/strings.xml
@@ -146,6 +146,7 @@
   <string name="title_decrypt">Decrypt</string>
   <string name="title_from_missing">Sender missing</string>
   <string name="title_to_missing">Recipient missing</string>
+  <string name="title_to_one">One recipient expected</string>
   <string name="title_attachments_missing">Attachments still loading</string>
   <string name="title_draft_trashed">Draft trashed</string>
   <string name="title_draft_saved">Draft saved</string>
diff --git a/app/src/main/res/values-nl/strings.xml b/app/src/main/res/values-nl/strings.xml
index 71f6f61e..5b63fc95 100644
--- a/app/src/main/res/values-nl/strings.xml
+++ b/app/src/main/res/values-nl/strings.xml
@@ -146,6 +146,7 @@
   <string name="title_decrypt">Decrypt</string>
   <string name="title_from_missing">Sender missing</string>
   <string name="title_to_missing">Recipient missing</string>
+  <string name="title_to_one">One recipient expected</string>
   <string name="title_attachments_missing">Attachments still loading</string>
   <string name="title_draft_trashed">Draft trashed</string>
   <string name="title_draft_saved">Draft saved</string>
diff --git a/app/src/main/res/values-no/strings.xml b/app/src/main/res/values-no/strings.xml
index 71f6f61e..5b63fc95 100644
--- a/app/src/main/res/values-no/strings.xml
+++ b/app/src/main/res/values-no/strings.xml
@@ -146,6 +146,7 @@
   <string name="title_decrypt">Decrypt</string>
   <string name="title_from_missing">Sender missing</string>
   <string name="title_to_missing">Recipient missing</string>
+  <string name="title_to_one">One recipient expected</string>
   <string name="title_attachments_missing">Attachments still loading</string>
   <string name="title_draft_trashed">Draft trashed</string>
   <string name="title_draft_saved">Draft saved</string>
diff --git a/app/src/main/res/values-pl/strings.xml b/app/src/main/res/values-pl/strings.xml
index 46bef068..7429464f 100644
--- a/app/src/main/res/values-pl/strings.xml
+++ b/app/src/main/res/values-pl/strings.xml
@@ -154,6 +154,7 @@
   <string name="title_decrypt">Odszyfruj</string>
   <string name="title_from_missing">Brak nadawcy</string>
   <string name="title_to_missing">Brak adresata</string>
+  <string name="title_to_one">One recipient expected</string>
   <string name="title_attachments_missing">Załączniki są wciąż ładowane</string>
   <string name="title_draft_trashed">Szkice usunięte</string>
   <string name="title_draft_saved">Szkic zapisany</string>
diff --git a/app/src/main/res/values-pt-rBR/strings.xml b/app/src/main/res/values-pt-rBR/strings.xml
index 1d02711b..71c2aab4 100644
--- a/app/src/main/res/values-pt-rBR/strings.xml
+++ b/app/src/main/res/values-pt-rBR/strings.xml
@@ -146,6 +146,7 @@
   <string name="title_decrypt">Decrypt</string>
   <string name="title_from_missing">Remetente faltante</string>
   <string name="title_to_missing">Destinatário faltante</string>
+  <string name="title_to_one">One recipient expected</string>
   <string name="title_attachments_missing">Attachments still loading</string>
   <string name="title_draft_trashed">Rascunho excluído</string>
   <string name="title_draft_saved">Rascunho salvo</string>
diff --git a/app/src/main/res/values-pt-rPT/strings.xml b/app/src/main/res/values-pt-rPT/strings.xml
index 71f6f61e..5b63fc95 100644
--- a/app/src/main/res/values-pt-rPT/strings.xml
+++ b/app/src/main/res/values-pt-rPT/strings.xml
@@ -146,6 +146,7 @@
   <string name="title_decrypt">Decrypt</string>
   <string name="title_from_missing">Sender missing</string>
   <string name="title_to_missing">Recipient missing</string>
+  <string name="title_to_one">One recipient expected</string>
   <string name="title_attachments_missing">Attachments still loading</string>
   <string name="title_draft_trashed">Draft trashed</string>
   <string name="title_draft_saved">Draft saved</string>
diff --git a/app/src/main/res/values-ro/strings.xml b/app/src/main/res/values-ro/strings.xml
index 25c04eac..92472bb7 100644
--- a/app/src/main/res/values-ro/strings.xml
+++ b/app/src/main/res/values-ro/strings.xml
@@ -150,6 +150,7 @@
   <string name="title_decrypt">Decriptare</string>
   <string name="title_from_missing">Expeditor lipsă</string>
   <string name="title_to_missing">Destinatar lipsă</string>
+  <string name="title_to_one">One recipient expected</string>
   <string name="title_attachments_missing">Atașamentele încă se încarcă</string>
   <string name="title_draft_trashed">Ciornă trimisă la gunoi</string>
   <string name="title_draft_saved">Ciornă salvată</string>
diff --git a/app/src/main/res/values-ru/strings.xml b/app/src/main/res/values-ru/strings.xml
index 2476bb8e..e924d4a2 100644
--- a/app/src/main/res/values-ru/strings.xml
+++ b/app/src/main/res/values-ru/strings.xml
@@ -154,6 +154,7 @@
   <string name="title_decrypt">Decrypt</string>
   <string name="title_from_missing">Sender missing</string>
   <string name="title_to_missing">Recipient missing</string>
+  <string name="title_to_one">One recipient expected</string>
   <string name="title_attachments_missing">Attachments still loading</string>
   <string name="title_draft_trashed">Draft trashed</string>
   <string name="title_draft_saved">Draft saved</string>
diff --git a/app/src/main/res/values-sr/strings.xml b/app/src/main/res/values-sr/strings.xml
index a6179f98..4a26319f 100644
--- a/app/src/main/res/values-sr/strings.xml
+++ b/app/src/main/res/values-sr/strings.xml
@@ -150,6 +150,7 @@
   <string name="title_decrypt">Decrypt</string>
   <string name="title_from_missing">Sender missing</string>
   <string name="title_to_missing">Recipient missing</string>
+  <string name="title_to_one">One recipient expected</string>
   <string name="title_attachments_missing">Attachments still loading</string>
   <string name="title_draft_trashed">Draft trashed</string>
   <string name="title_draft_saved">Draft saved</string>
diff --git a/app/src/main/res/values-sv-rSE/strings.xml b/app/src/main/res/values-sv-rSE/strings.xml
index 71f6f61e..5b63fc95 100644
--- a/app/src/main/res/values-sv-rSE/strings.xml
+++ b/app/src/main/res/values-sv-rSE/strings.xml
@@ -146,6 +146,7 @@
   <string name="title_decrypt">Decrypt</string>
   <string name="title_from_missing">Sender missing</string>
   <string name="title_to_missing">Recipient missing</string>
+  <string name="title_to_one">One recipient expected</string>
   <string name="title_attachments_missing">Attachments still loading</string>
   <string name="title_draft_trashed">Draft trashed</string>
   <string name="title_draft_saved">Draft saved</string>
diff --git a/app/src/main/res/values-tr/strings.xml b/app/src/main/res/values-tr/strings.xml
index 9b4c50c7..060be353 100644
--- a/app/src/main/res/values-tr/strings.xml
+++ b/app/src/main/res/values-tr/strings.xml
@@ -146,6 +146,7 @@
   <string name="title_decrypt">Şifre çöz</string>
   <string name="title_from_missing">Gönderici Eksik</string>
   <string name="title_to_missing">Alıcı eksik</string>
+  <string name="title_to_one">One recipient expected</string>
   <string name="title_attachments_missing">Ekler hala yükleniyor</string>
   <string name="title_draft_trashed">Taslak çöp kutusuna atıldı</string>
   <string name="title_draft_saved">Taslak kaydedildi</string>
diff --git a/app/src/main/res/values-uk/strings.xml b/app/src/main/res/values-uk/strings.xml
index 2476bb8e..e924d4a2 100644
--- a/app/src/main/res/values-uk/strings.xml
+++ b/app/src/main/res/values-uk/strings.xml
@@ -154,6 +154,7 @@
   <string name="title_decrypt">Decrypt</string>
   <string name="title_from_missing">Sender missing</string>
   <string name="title_to_missing">Recipient missing</string>
+  <string name="title_to_one">One recipient expected</string>
   <string name="title_attachments_missing">Attachments still loading</string>
   <string name="title_draft_trashed">Draft trashed</string>
   <string name="title_draft_saved">Draft saved</string>
diff --git a/app/src/main/res/values-vi/strings.xml b/app/src/main/res/values-vi/strings.xml
index 0cea958a..d94ccd08 100644
--- a/app/src/main/res/values-vi/strings.xml
+++ b/app/src/main/res/values-vi/strings.xml
@@ -142,6 +142,7 @@
   <string name="title_decrypt">Decrypt</string>
   <string name="title_from_missing">Sender missing</string>
   <string name="title_to_missing">Recipient missing</string>
+  <string name="title_to_one">One recipient expected</string>
   <string name="title_attachments_missing">Attachments still loading</string>
   <string name="title_draft_trashed">Draft trashed</string>
   <string name="title_draft_saved">Draft saved</string>
diff --git a/app/src/main/res/values-zh-rCN/strings.xml b/app/src/main/res/values-zh-rCN/strings.xml
index 4f7bf10f..4d836a0b 100644
--- a/app/src/main/res/values-zh-rCN/strings.xml
+++ b/app/src/main/res/values-zh-rCN/strings.xml
@@ -142,6 +142,7 @@
   <string name="title_decrypt">解密</string>
   <string name="title_from_missing">缺少发件人</string>
   <string name="title_to_missing">缺少收件人</string>
+  <string name="title_to_one">One recipient expected</string>
   <string name="title_attachments_missing">附件加载中</string>
   <string name="title_draft_trashed">草稿已删除</string>
   <string name="title_draft_saved">草稿已保存</string>
diff --git a/app/src/main/res/values-zh-rTW/strings.xml b/app/src/main/res/values-zh-rTW/strings.xml
index 0cea958a..d94ccd08 100644
--- a/app/src/main/res/values-zh-rTW/strings.xml
+++ b/app/src/main/res/values-zh-rTW/strings.xml
@@ -142,6 +142,7 @@
   <string name="title_decrypt">Decrypt</string>
   <string name="title_from_missing">Sender missing</string>
   <string name="title_to_missing">Recipient missing</string>
+  <string name="title_to_one">One recipient expected</string>
   <string name="title_attachments_missing">Attachments still loading</string>
   <string name="title_draft_trashed">Draft trashed</string>
   <string name="title_draft_saved">Draft saved</string>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index e886ef6c..1c8f2f1d 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -173,6 +173,7 @@
 
     <string name="title_from_missing">Sender missing</string>
     <string name="title_to_missing">Recipient missing</string>
+    <string name="title_to_one">One recipient expected</string>
     <string name="title_attachments_missing">Attachments still loading</string>
     <string name="title_draft_trashed">Draft trashed</string>
     <string name="title_draft_saved">Draft saved</string>