diff --git a/app/src/main/java/eu/faircode/email/FragmentCompose.java b/app/src/main/java/eu/faircode/email/FragmentCompose.java
index fb54f8e5ed..1279891a03 100644
--- a/app/src/main/java/eu/faircode/email/FragmentCompose.java
+++ b/app/src/main/java/eu/faircode/email/FragmentCompose.java
@@ -3095,6 +3095,15 @@ public class FragmentCompose extends FragmentBase {
         // Workaround underlines left by Android
         etBody.clearComposingText();
 
+        Editable e = etBody.getText();
+        boolean notext = e.toString().trim().isEmpty();
+        boolean formatted = false;
+        for (Object span : e.getSpans(0, e.length(), Object.class))
+            if (span instanceof CharacterStyle || span instanceof ParagraphStyle) {
+                formatted = true;
+                break;
+            }
+
         Bundle args = new Bundle();
         args.putLong("id", working);
         args.putInt("action", action);
@@ -3108,7 +3117,8 @@ public class FragmentCompose extends FragmentBase {
         args.putString("body", HtmlHelper.toHtml(etBody.getText(), getContext()));
         args.putBoolean("signature", cbSignature.isChecked());
         args.putBoolean("empty", isEmpty());
-        args.putBoolean("notext", etBody.getText().toString().trim().isEmpty());
+        args.putBoolean("notext", notext);
+        args.putBoolean("formatted", formatted);
         args.putBoolean("interactive", getLifecycle().getCurrentState().isAtLeast(Lifecycle.State.RESUMED));
         args.putBundle("extras", extras);
 
@@ -4825,11 +4835,13 @@ public class FragmentCompose extends FragmentBase {
                 boolean remind_text = args.getBoolean("remind_text", false);
                 boolean remind_attachment = args.getBoolean("remind_attachment", false);
                 boolean remind_size = args.getBoolean("remind_size", false);
+                boolean formatted = args.getBoolean("formatted", false);
 
                 int recipients = (draft.to == null ? 0 : draft.to.length) +
                         (draft.cc == null ? 0 : draft.cc.length) +
                         (draft.bcc == null ? 0 : draft.bcc.length);
                 if (send_dialog || address_error != null || mx_error != null || recipients > RECIPIENTS_WARNING || remind_size ||
+                        (formatted && (draft.plain_only != null && draft.plain_only)) ||
                         (send_reminders &&
                                 (remind_to || remind_extra || remind_pgp || remind_subject || remind_text || remind_attachment))) {
                     setBusy(false);
@@ -5449,6 +5461,7 @@ public class FragmentCompose extends FragmentBase {
             final boolean remind_text = args.getBoolean("remind_text", false);
             final boolean remind_attachment = args.getBoolean("remind_attachment", false);
             final boolean remind_size = args.getBoolean("remind_size", false);
+            final boolean formatted = args.getBoolean("formatted", false);
             final long size = args.getLong("size", -1);
             final long max_size = args.getLong("max_size", -1);
 
@@ -5475,6 +5488,7 @@ public class FragmentCompose extends FragmentBase {
             final TextView tvTo = dview.findViewById(R.id.tvTo);
             final TextView tvVia = dview.findViewById(R.id.tvVia);
             final CheckBox cbPlainOnly = dview.findViewById(R.id.cbPlainOnly);
+            final TextView tvRemindPlain = dview.findViewById(R.id.tvRemindPlain);
             final CheckBox cbReceipt = dview.findViewById(R.id.cbReceipt);
             final TextView tvReceipt = dview.findViewById(R.id.tvReceiptType);
             final Spinner spEncrypt = dview.findViewById(R.id.spEncrypt);
@@ -5502,6 +5516,7 @@ public class FragmentCompose extends FragmentBase {
 
             tvTo.setText(null);
             tvVia.setText(null);
+            tvRemindPlain.setVisibility(View.GONE);
             tvReceipt.setVisibility(View.GONE);
             spEncrypt.setTag(0);
             spEncrypt.setSelection(0);
@@ -5543,6 +5558,8 @@ public class FragmentCompose extends FragmentBase {
             cbPlainOnly.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
                 @Override
                 public void onCheckedChanged(CompoundButton compoundButton, boolean checked) {
+                    tvRemindPlain.setVisibility(checked && formatted ? View.VISIBLE : View.GONE);
+
                     Bundle args = new Bundle();
                     args.putLong("id", id);
                     args.putBoolean("plain_only", checked);
diff --git a/app/src/main/res/layout/dialog_send.xml b/app/src/main/res/layout/dialog_send.xml
index 6559676173..cd8215845f 100644
--- a/app/src/main/res/layout/dialog_send.xml
+++ b/app/src/main/res/layout/dialog_send.xml
@@ -184,6 +184,17 @@
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toBottomOf="@id/tvVia" />
 
+        <eu.faircode.email.FixedTextView
+            android:id="@+id/tvRemindPlain"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="6dp"
+            android:text="@string/title_plain_reminder"
+            android:textAppearance="@style/TextAppearance.AppCompat.Medium"
+            android:textColor="?attr/colorWarning"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@id/cbPlainOnly" />
+
         <CheckBox
             android:id="@+id/cbReceipt"
             android:layout_width="wrap_content"
@@ -192,7 +203,7 @@
             android:text="@string/title_send_receipt"
             android:textAppearance="@style/TextAppearance.AppCompat.Medium"
             app:layout_constraintStart_toStartOf="parent"
-            app:layout_constraintTop_toBottomOf="@id/cbPlainOnly" />
+            app:layout_constraintTop_toBottomOf="@id/tvRemindPlain" />
 
         <eu.faircode.email.FixedTextView
             android:id="@+id/tvReceiptType"
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index c0db03ad7b..23a8b8fdc3 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -995,6 +995,7 @@
     <string name="title_text_reminder">Message is empty</string>
     <string name="title_attachment_keywords">attached,attachment,attachments,included</string>
     <string name="title_attachment_reminder">Did you intend to add an attachment?</string>
+    <string name="title_plain_reminder">All formatting will go lost</string>
     <string name="title_size_reminder">Message (%1$s) larger than server limit (%2$s)</string>
     <string name="title_attachments_missing">Not all attachments have been downloaded</string>
     <string name="title_dialog_hint">This dialog can be enabled again via the three-dots menu in the top action bar</string>