diff --git a/FunGame.Core/Api/Transmittal/MailSender.cs b/FunGame.Core/Api/Transmittal/MailSender.cs
index bf9c1a1..d728c18 100644
--- a/FunGame.Core/Api/Transmittal/MailSender.cs
+++ b/FunGame.Core/Api/Transmittal/MailSender.cs
@@ -1,4 +1,4 @@
-using Milimoe.FunGame.Core.Interface.Base;
+using System.Net.Mail;
 using Milimoe.FunGame.Core.Library.Common.Network;
 using Milimoe.FunGame.Core.Library.Constant;
 using Milimoe.FunGame.Core.Library.Server;
@@ -6,23 +6,43 @@ using Milimoe.FunGame.Core.Service;
 
 namespace Milimoe.FunGame.Core.Api.Transmittal
 {
-    public class MailSender
+    public class MailSender : IDisposable
     {
+        public Guid MailSenderID { get; }
         public SmtpClientInfo SmtpClientInfo => _SmtpClientInfo;
         public MailSendResult LastestResult => _LastestResult;
+        public string ErrorMsg => _ErrorMsg;
 
-        private SmtpClientInfo _SmtpClientInfo;
+        private readonly SmtpClientInfo _SmtpClientInfo;
         private MailSendResult _LastestResult = MailSendResult.NotSend;
+        private string _ErrorMsg = "";
 
         public MailSender(string SenderMailAddress, string SenderName, string SenderPassword, string Host, int Port, bool OpenSSL)
         {
+            MailSenderID = Guid.NewGuid();
             _SmtpClientInfo = new SmtpClientInfo(SenderMailAddress, SenderName, SenderPassword, Host, Port, OpenSSL);
         }
 
+        public MailObject CreateMail(string Subject, string Body, MailPriority Priority, bool HTML, string[] ToList, string[] CCList, string[] BCCList)
+        {
+            return new MailObject(this, Subject, Body, Priority, HTML, ToList, CCList, BCCList);
+        }
+
         public MailSendResult Send(MailObject Mail)
         {
-            _LastestResult = MailManager.Send(this, Mail);
+            _LastestResult = MailManager.Send(this, Mail, out _ErrorMsg);
             return _LastestResult;
         }
+
+        public bool Dispose()
+        {
+            return MailManager.Dispose(this);
+        }
+
+        void IDisposable.Dispose()
+        {
+            MailManager.Dispose(this);
+            GC.SuppressFinalize(this);
+        }
     }
 }
diff --git a/FunGame.Core/Library/Common/Network/MailObject.cs b/FunGame.Core/Library/Common/Network/MailObject.cs
index 5000760..2d9ef2e 100644
--- a/FunGame.Core/Library/Common/Network/MailObject.cs
+++ b/FunGame.Core/Library/Common/Network/MailObject.cs
@@ -1,4 +1,5 @@
 using System.Net.Mail;
+using Milimoe.FunGame.Core.Api.Transmittal;
 
 namespace Milimoe.FunGame.Core.Library.Common.Network
 {
@@ -12,17 +13,19 @@ namespace Milimoe.FunGame.Core.Library.Common.Network
         public bool HTML { get; } = false;
         public string[] ToList { get; } = Array.Empty<string>();
         public string[] CCList { get; } = Array.Empty<string>();
+        public string[] BCCList { get; } = Array.Empty<string>();
 
-        public MailObject(string Sender, string SenderName, string Subject, string Body, MailPriority Priority, bool HTML, string[] ToList, string[] CcList)
+        public MailObject(MailSender Sender, string Subject, string Body, MailPriority Priority, bool HTML, string[] ToList, string[] CCList, string[] BCCList)
         {
-            this.Sender = Sender;
-            this.SenderName = SenderName;
+            this.Sender = Sender.SmtpClientInfo.SenderMailAddress;
+            this.SenderName = Sender.SmtpClientInfo.SenderName;
             this.Subject = Subject;
             this.Body = Body;
             this.Priority = Priority;
             this.HTML = HTML;
             this.ToList = ToList;
-            this.CCList = CcList;
+            this.CCList = CCList;
+            this.BCCList = BCCList;
         }
     }
 }
diff --git a/FunGame.Core/Service/MailManager.cs b/FunGame.Core/Service/MailManager.cs
index 8f6116c..7edc08e 100644
--- a/FunGame.Core/Service/MailManager.cs
+++ b/FunGame.Core/Service/MailManager.cs
@@ -1,53 +1,83 @@
-using System.Net;
+using System.Collections;
+using System.Net;
 using System.Net.Mail;
 using Milimoe.FunGame.Core.Api.Transmittal;
 using Milimoe.FunGame.Core.Library.Common.Network;
 using Milimoe.FunGame.Core.Library.Constant;
+using Milimoe.FunGame.Core.Library.Exception;
 using Milimoe.FunGame.Core.Library.Server;
 
 namespace Milimoe.FunGame.Core.Service
 {
     internal class MailManager
     {
-        internal SmtpClient? SmtpClient { get; }
+        internal static Hashtable HashClient { get; } = new Hashtable();
 
-        internal static MailSendResult Send(MailSender Sender, MailObject Mail)
+        internal static MailSendResult Send(MailSender Sender, MailObject Mail, out string ErrorMsg)
         {
-            SmtpClientInfo Info = Sender.SmtpClientInfo;
-            SmtpClient Smtp = new()
-            {
-                Host = Info.Host,
-                Port = Info.Port,
-                EnableSsl = Info.OpenSSL,
-                DeliveryMethod = SmtpDeliveryMethod.Network,
-                Credentials = new NetworkCredential(Info.SenderMailAddress, Info.SenderPassword)
-            };
-            MailMessage Msg = new()
-            {
-                Subject = Mail.Subject,
-                SubjectEncoding = General.DefaultEncoding,
-                Body = Mail.Body,
-                BodyEncoding = General.DefaultEncoding,
-                From = new MailAddress(Mail.Sender, Mail.SenderName, General.DefaultEncoding),
-                IsBodyHtml = Mail.HTML,
-                Priority = Mail.Priority
-            };
-            foreach (string To in Mail.ToList)
-            {
-                Msg.To.Add(To);
-            }
-            foreach (string CC in Mail.CCList)
-            {
-                Msg.CC.Add(CC);
-            }
+            ErrorMsg = "";
             try
             {
+                SmtpClientInfo Info = Sender.SmtpClientInfo;
+                SmtpClient Smtp;
+                Guid MailSenderID = Sender.MailSenderID;
+                if (!HashClient.ContainsKey(MailSenderID))
+                {
+                    Smtp = new()
+                    {
+                        Host = Info.Host,
+                        Port = Info.Port,
+                        EnableSsl = Info.OpenSSL,
+                        DeliveryMethod = SmtpDeliveryMethod.Network,
+                        Credentials = new NetworkCredential(Info.SenderMailAddress, Info.SenderPassword)
+                    };
+                    HashClient.Add(MailSenderID, Smtp);
+                }
+                else Smtp = (SmtpClient)HashClient[MailSenderID]!;
+                MailMessage Msg = new()
+                {
+                    Subject = Mail.Subject,
+                    SubjectEncoding = General.DefaultEncoding,
+                    Body = Mail.Body,
+                    BodyEncoding = General.DefaultEncoding,
+                    From = new MailAddress(Mail.Sender, Mail.SenderName, General.DefaultEncoding),
+                    IsBodyHtml = Mail.HTML,
+                    Priority = Mail.Priority
+                };
+                foreach (string To in Mail.ToList)
+                {
+                    Msg.To.Add(To);
+                }
+                foreach (string CC in Mail.CCList)
+                {
+                    Msg.CC.Add(CC);
+                }
                 Smtp.Send(Msg);
                 return MailSendResult.Success;
             }
+            catch (Exception e)
+            {
+                ErrorMsg = e.GetErrorInfo();
+                return MailSendResult.Fail;
+            }
+        }
+
+        internal static bool Dispose(MailSender Sender)
+        {
+            try
+            {
+                Guid MailSenderID = Sender.MailSenderID;
+                if (HashClient.ContainsKey(MailSenderID))
+                {
+                    ((SmtpClient)HashClient[MailSenderID]!).Dispose();
+                    HashClient.Remove(MailSenderID);
+                    return true;
+                }
+                return false;
+            }
             catch
             {
-                return MailSendResult.Fail;
+                return false;
             }
         }
     }