diff --git a/migration/i5.1/oracle/201803031514_IDEMPIERE-3647.sql b/migration/i5.1/oracle/201803031514_IDEMPIERE-3647.sql
new file mode 100644
index 0000000000..942d369d41
--- /dev/null
+++ b/migration/i5.1/oracle/201803031514_IDEMPIERE-3647.sql
@@ -0,0 +1,10 @@
+SET SQLBLANKLINES ON
+SET DEFINE OFF
+
+-- IDEMPIERE-3647 Better disposal of acknowledge flag in the e-mail dialog
+-- 03/03/2018 15h10min45s BRT
+INSERT INTO AD_Message (MsgType,MsgText,AD_Client_ID,AD_Org_ID,IsActive,Created,CreatedBy,Updated,UpdatedBy,AD_Message_ID,Value,EntityType,AD_Message_UU) VALUES ('I','Request a Read Receipt',0,0,'Y',TO_DATE('2018-03-03 15:10:44','YYYY-MM-DD HH24:MI:SS'),0,TO_DATE('2018-03-03 15:10:44','YYYY-MM-DD HH24:MI:SS'),0,200450,'RequestReadReceipt','D','8f7f20d2-e518-4ada-a271-013e4801f648')
+;
+
+SELECT register_migration_script('201803031514_IDEMPIERE-3647.sql') FROM dual
+;
diff --git a/migration/i5.1/postgresql/201803031514_IDEMPIERE-3647.sql b/migration/i5.1/postgresql/201803031514_IDEMPIERE-3647.sql
new file mode 100644
index 0000000000..fa8102257a
--- /dev/null
+++ b/migration/i5.1/postgresql/201803031514_IDEMPIERE-3647.sql
@@ -0,0 +1,7 @@
+-- IDEMPIERE-3647 Better disposal of acknowledge flag in the e-mail dialog
+-- 03/03/2018 15h10min45s BRT
+INSERT INTO AD_Message (MsgType,MsgText,AD_Client_ID,AD_Org_ID,IsActive,Created,CreatedBy,Updated,UpdatedBy,AD_Message_ID,Value,EntityType,AD_Message_UU) VALUES ('I','Request a Read Receipt',0,0,'Y',TO_TIMESTAMP('2018-03-03 15:10:44','YYYY-MM-DD HH24:MI:SS'),0,TO_TIMESTAMP('2018-03-03 15:10:44','YYYY-MM-DD HH24:MI:SS'),0,200450,'RequestReadReceipt','D','8f7f20d2-e518-4ada-a271-013e4801f648')
+;
+
+SELECT register_migration_script('201803031514_IDEMPIERE-3647.sql') FROM dual
+;
diff --git a/org.adempiere.ui.zk/WEB-INF/src/org/adempiere/webui/window/WEMailDialog.java b/org.adempiere.ui.zk/WEB-INF/src/org/adempiere/webui/window/WEMailDialog.java
index 276d742547..be27e656c5 100644
--- a/org.adempiere.ui.zk/WEB-INF/src/org/adempiere/webui/window/WEMailDialog.java
+++ b/org.adempiere.ui.zk/WEB-INF/src/org/adempiere/webui/window/WEMailDialog.java
@@ -244,7 +244,7 @@ public class WEMailDialog extends Window implements EventListener<Event>, ValueC
 		lSubject.setValue(Msg.getMsg(Env.getCtx(), "Subject") + ":");
 		lAttachment.setValue(Msg.getMsg(Env.getCtx(), "Attachment") + ":");
 		fFrom.setReadonly(true);
-		isAcknowledgmentReceipt.setLabel(Msg.getMsg(Env.getCtx(), "Acknowledge"));
+		isAcknowledgmentReceipt.setLabel(Msg.getMsg(Env.getCtx(), "RequestReadReceipt"));
 		//
 				
 		Grid grid = new Grid();
@@ -254,10 +254,10 @@ public class WEMailDialog extends Window implements EventListener<Event>, ValueC
         
         Columns columns = new Columns();
         Column column = new Column();
-        ZKUpdateUtil.setWidth(column, "30%");
+        ZKUpdateUtil.setWidth(column, "10%");
         columns.appendChild(column);
         column = new Column();
-        ZKUpdateUtil.setWidth(column, "70%");
+        ZKUpdateUtil.setWidth(column, "90%");
         columns.appendChild(column);
         grid.appendChild(columns);
         
@@ -284,7 +284,7 @@ public class WEMailDialog extends Window implements EventListener<Event>, ValueC
 		
 		row = new Row();
 		rows.appendChild(row);
-		row.appendChild(isAcknowledgmentReceipt);
+		row.appendChild(new Label(""));
 		row.appendChild(fTo);
 		ZKUpdateUtil.setHflex(fTo, "1");
 		
@@ -302,6 +302,11 @@ public class WEMailDialog extends Window implements EventListener<Event>, ValueC
 		row.appendChild(new Label(""));
 		row.appendChild(fCc);
 		ZKUpdateUtil.setHflex(fCc, "1");
+		
+		row = new Row();
+		rows.appendChild(row);
+		row.appendChild(new Label(""));
+		row.appendChild(isAcknowledgmentReceipt);
 				
 		row = new Row();
 		rows.appendChild(row);