diff --git a/app/src/main/java/eu/faircode/email/AdapterMessage.java b/app/src/main/java/eu/faircode/email/AdapterMessage.java
index 00d2903b6e..509aa0ae95 100644
--- a/app/src/main/java/eu/faircode/email/AdapterMessage.java
+++ b/app/src/main/java/eu/faircode/email/AdapterMessage.java
@@ -5944,8 +5944,9 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
                         return null;
 
                     if (!TextUtils.isEmpty(message.inreplyto))
-                        for (EntityMessage m : db.message().getMessagesByMsgId(message.account, message.inreplyto))
-                            map.put(m.msgid, m);
+                        for (String inreplyto : message.inreplyto.split(" "))
+                            for (EntityMessage m : db.message().getMessagesByMsgId(message.account, inreplyto))
+                                map.put(m.msgid, m);
 
                     if (!TextUtils.isEmpty(message.references))
                         for (String ref : message.references.split(" "))
@@ -5970,7 +5971,8 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
                         start = ssb.length();
                         ssb.append("In-reply-to: ");
                         ssb.setSpan(new StyleSpan(Typeface.BOLD), start, ssb.length(), 0);
-                        ssb.append(message.inreplyto).append("\n");
+                        for (String inreplyto : message.inreplyto.split(" "))
+                            ssb.append(inreplyto).append("\n");
                     }
 
                     if (!TextUtils.isEmpty(message.references)) {
diff --git a/app/src/main/java/eu/faircode/email/Core.java b/app/src/main/java/eu/faircode/email/Core.java
index d5cb0aacb7..639ae482db 100644
--- a/app/src/main/java/eu/faircode/email/Core.java
+++ b/app/src/main/java/eu/faircode/email/Core.java
@@ -4242,11 +4242,12 @@ class Core {
 
                             List<EntityMessage> all = new ArrayList<>();
 
-                            if (message.inreplyto != null) {
-                                List<EntityMessage> replied = db.message().getMessagesByMsgId(folder.account, message.inreplyto);
-                                if (replied != null)
-                                    all.addAll(replied);
-                            }
+                            if (message.inreplyto != null)
+                                for (String inreplyto : message.inreplyto.split(" ")) {
+                                    List<EntityMessage> replied = db.message().getMessagesByMsgId(folder.account, inreplyto);
+                                    if (replied != null)
+                                        all.addAll(replied);
+                                }
                             if (r.refid != null) {
                                 List<EntityMessage> refs = db.message().getMessagesByMsgId(folder.account, r.refid);
                                 if (refs != null)
@@ -4261,7 +4262,8 @@ class Core {
                                 }
 
                             for (EntityFolder f : map.values())
-                                EntityOperation.queue(context, f, EntityOperation.REPORT, message.inreplyto, label);
+                                for (String inreplyto : message.inreplyto.split(" "))
+                                    EntityOperation.queue(context, f, EntityOperation.REPORT, inreplyto, label);
                         }
                     }
                 } catch (Throwable ex) {
diff --git a/app/src/main/java/eu/faircode/email/FragmentCompose.java b/app/src/main/java/eu/faircode/email/FragmentCompose.java
index 391ae7bca7..aea31a4fe3 100644
--- a/app/src/main/java/eu/faircode/email/FragmentCompose.java
+++ b/app/src/main/java/eu/faircode/email/FragmentCompose.java
@@ -6464,12 +6464,13 @@ public class FragmentCompose extends FragmentBase {
 
                         if (extras.getBoolean("archive")) {
                             EntityFolder archive = db.folder().getFolderByType(draft.account, EntityFolder.ARCHIVE);
-                            if (archive != null) {
-                                List<EntityMessage> messages = db.message().getMessagesByMsgId(draft.account, draft.inreplyto);
-                                if (messages != null)
-                                    for (EntityMessage message : messages)
-                                        EntityOperation.queue(context, message, EntityOperation.MOVE, archive.id);
-                            }
+                            if (archive != null)
+                                for (String inreplyto : draft.inreplyto.split(" ")) {
+                                    List<EntityMessage> messages = db.message().getMessagesByMsgId(draft.account, inreplyto);
+                                    if (messages != null)
+                                        for (EntityMessage message : messages)
+                                            EntityOperation.queue(context, message, EntityOperation.MOVE, archive.id);
+                                }
                         }
                     }
                 }
@@ -7954,18 +7955,15 @@ public class FragmentCompose extends FragmentBase {
                         return false;
                     }
 
-                    List<EntityMessage> messages = db.message().getMessagesByMsgId(draft.account, draft.inreplyto);
-                    if (messages == null || messages.size() == 0) {
-                        args.putString("reason", "In-reply-to gone");
-                        return false;
-                    }
-
-                    for (EntityMessage message : messages) {
-                        EntityFolder folder = db.folder().getFolder(message.folder);
-                        if (folder == null)
-                            continue;
-                        if (EntityFolder.INBOX.equals(folder.type) || EntityFolder.USER.equals(folder.type))
-                            return true;
+                    for (String inreplyto : draft.inreplyto.split(" ")) {
+                        List<EntityMessage> messages = db.message().getMessagesByMsgId(draft.account, inreplyto);
+                        for (EntityMessage message : messages) {
+                            EntityFolder folder = db.folder().getFolder(message.folder);
+                            if (folder == null)
+                                continue;
+                            if (EntityFolder.INBOX.equals(folder.type) || EntityFolder.USER.equals(folder.type))
+                                return true;
+                        }
                     }
 
                     args.putString("reason", "Not in inbox or unread");
diff --git a/app/src/main/java/eu/faircode/email/MessageHelper.java b/app/src/main/java/eu/faircode/email/MessageHelper.java
index 408cde6e37..271b7f30fc 100644
--- a/app/src/main/java/eu/faircode/email/MessageHelper.java
+++ b/app/src/main/java/eu/faircode/email/MessageHelper.java
@@ -1314,7 +1314,7 @@ public class MessageHelper {
 
     String getInReplyTo() throws MessagingException {
         String[] a = getInReplyTos();
-        return (a.length < 1 ? null : a[0]);
+        return (a.length == 0 ? null : TextUtils.join(" ", a));
     }
 
     String[] getInReplyTos() throws MessagingException {
diff --git a/app/src/main/java/eu/faircode/email/ServiceSend.java b/app/src/main/java/eu/faircode/email/ServiceSend.java
index 123563bbda..819b28000d 100644
--- a/app/src/main/java/eu/faircode/email/ServiceSend.java
+++ b/app/src/main/java/eu/faircode/email/ServiceSend.java
@@ -566,21 +566,24 @@ public class ServiceSend extends ServiceBase implements SharedPreferences.OnShar
         Long sid = null;
         EntityFolder sent = null;
 
-        if (reply_move && !TextUtils.isEmpty(message.inreplyto)) {
-            List<EntityMessage> replied = db.message().getMessagesByMsgId(message.account, message.inreplyto);
-            if (replied != null)
-                for (EntityMessage m : replied)
-                    if (!m.ui_hide) {
-                        EntityFolder folder = db.folder().getFolder(m.folder);
-                        if (folder != null &&
-                                (EntityFolder.INBOX.equals(folder.type) ||
-                                        EntityFolder.ARCHIVE.equals(folder.type) ||
-                                        EntityFolder.USER.equals(folder.type))) {
-                            sent = folder;
-                            break;
+        if (reply_move && !TextUtils.isEmpty(message.inreplyto))
+            for (String inreplyto : message.inreplyto.split(" ")) {
+                List<EntityMessage> replied = db.message().getMessagesByMsgId(message.account, inreplyto);
+                if (replied != null)
+                    for (EntityMessage m : replied)
+                        if (!m.ui_hide) {
+                            EntityFolder folder = db.folder().getFolder(m.folder);
+                            if (folder != null &&
+                                    (EntityFolder.INBOX.equals(folder.type) ||
+                                            EntityFolder.ARCHIVE.equals(folder.type) ||
+                                            EntityFolder.USER.equals(folder.type))) {
+                                sent = folder;
+                                break;
+                            }
                         }
-                    }
-        }
+                if (sent != null)
+                    break;
+            }
 
         if (sent == null)
             sent = db.folder().getFolderByType(message.account, EntityFolder.SENT);
@@ -804,11 +807,12 @@ public class ServiceSend extends ServiceBase implements SharedPreferences.OnShar
             }
 
             // Mark replied
-            if (message.inreplyto != null) {
-                List<EntityMessage> replieds = db.message().getMessagesByMsgId(message.account, message.inreplyto);
-                for (EntityMessage replied : replieds)
-                    EntityOperation.queue(this, replied, EntityOperation.ANSWERED, true);
-            }
+            if (message.inreplyto != null)
+                for (String inreplyto : message.inreplyto.split(" ")) {
+                    List<EntityMessage> replieds = db.message().getMessagesByMsgId(message.account, inreplyto);
+                    for (EntityMessage replied : replieds)
+                        EntityOperation.queue(this, replied, EntityOperation.ANSWERED, true);
+                }
 
             // Mark forwarded
             if (message.wasforwardedfrom != null) {