跪求帮助—一个邮箱认证软件，为什么总是500错误

我写了个邮箱认证程序，但是运行时总是返回00 error： bad syntax，请高手帮助看一下。
Dim Response As String, Reply As Integer
Dim Start As Single, Tmr As Single
Sub SendEmail(MailServerName As String, FromName As String, FromEmailAddress As String, ToName As String, ToEmailAddress As String, EmailSubject As String, EmailBodyOfMessage As String)
Winsock1.LocalPort = 0 ' Must set local port to 0 (Zero) or
'you can only send 1 e-mail per program
'start
If Winsock1.State = sckClosed Then 'Check to see if socet is closed

Winsock1.Protocol = sckTCPProtocol ' 通过Protocol属性可以设置WinSock控件连接远程计算机使用的协议。可选的协议是TCP和UDP对应的VB的常量分别是 sckTCPProtocol和sckUDPProtocol，Winsock控件默认协议是TCP。注意：虽然可以在运行时设置协议，但必须在连接未建立或断开连接后。
Winsock1.RemoteHost = "smtp.126.com" ' Set the server address
Winsock1.RemotePort = 25 ' Set the SMTP Port
Winsock1.Connect ' Start connection
WaitFor ("220")

StatusTxt.Caption = "Connecting...."
StatusTxt.Refresh

Winsock1.SendData ("HELO" + " " + vbCrLf)
WaitFor ("250")
StatusTxt.Caption = "Connected"
StatusTxt.Refresh

Winsock1.SendData ("AUTH LOGIN" + vbCrLf)
WaitFor ("334")
StatusTxt.Caption = "Sending AUTH LOGIN"
StatusTxt.Refresh

Winsock1.SendData (Base64_Encode("******@126.com") + vbCrLf)
WaitFor ("334")
StatusTxt.Caption = "Sending Username"
StatusTxt.Refresh

Winsock1.SendData (Base64_Encode("******") + vbCrLf)
WaitFor ("235")
StatusTxt.Caption = "Sending Password"
StatusTxt.Refresh

MsgBox "ok"


Winsock1.SendData ("quit" + vbCrLf)
StatusTxt.Caption = "Disconnecting"
StatusTxt.Refresh
WaitFor ("221")
Winsock1.Close
Else
MsgBox (Str(Winsock1.State))
End If
End Sub
Sub WaitFor(ResponseCode As String)
Start = Timer ' Time event so won't get stuck in loop
' MsgBox Start
While Len(Response) = 0
Tmr = Timer - Start
DoEvents ' Let System keep checking for incoming response **IMPORTANT**
If Tmr > 50 Then ' Time in seconds to wait
MsgBox "SMTP service error, timed out while waiting for response", 64, MsgTitle
Exit Sub

End If
Wend
While Left(Response, 3) <> ResponseCode
Tmr = Timer - Start
DoEvents
If Tmr > 50 Then
MsgBox "SMTP service error, impromper response code. Code should have been: " + ResponseCode + " Code recieved: " + Response, 64, MsgTitle
Exit Sub

End If
Wend
Response = "" ' Sent response code to blank **IMPORTANT**
End Sub
Private Sub Command1_Click()
SendEmail txtEmailServer.Text, txtFromName.Text, txtFromEmailAddress.Text, txtToEmailAddress.Text, txtToEmailAddress.Text, txtEmailSubject.Text, txtEmailBodyOfMessage.Text 'MsgBox ("Mail Sent")
StatusTxt.Caption = "Mail Sent"
StatusTxt.Refresh
Beep
Close
End Sub

Private Sub Winsock1_DataArrival(ByVal bytesTotal As Long)
Winsock1.GetData Response ' Check for incoming response *IMPORTANT*
End Sub
Private Function Base64_Encode(strSource) As String 'base6加密算法
Const BASE64_TABLE As String = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
Dim strTempLine As String
Dim j As Integer
For j = 1 To (Len(strSource) - Len(strSource) Mod 3) Step 3
strTempLine = strTempLine + Mid(BASE64_TABLE, (Asc(Mid(strSource, j, 1)) \ 4) + 1, 1)
strTempLine = strTempLine + Mid(BASE64_TABLE, ((Asc(Mid(strSource, j, 1)) Mod 4) * 16 _
+ Asc(Mid(strSource, j + 1, 1)) \ 16) + 1, 1)
strTempLine = strTempLine + Mid(BASE64_TABLE, ((Asc(Mid(strSource, j + 1, 1)) Mod 16) * 4 _
+ Asc(Mid(strSource, j + 2, 1)) \ 64) + 1, 1)
strTempLine = strTempLine + Mid(BASE64_TABLE, (Asc(Mid(strSource, j + 2, 1)) Mod 64) + 1, 1)
Next j
If Not (Len(strSource) Mod 3) = 0 Then
If (Len(strSource) Mod 3) = 2 Then
strTempLine = strTempLine + Mid(BASE64_TABLE, (Asc(Mid(strSource, j, 1)) \ 4) + 1, 1)
strTempLine = strTempLine + Mid(BASE64_TABLE, (Asc(Mid(strSource, j, 1)) Mod 4) * 16 _
+ Asc(Mid(strSource, j + 1, 1)) \ 16 + 1, 1)
strTempLine = strTempLine + Mid(BASE64_TABLE, (Asc(Mid(strSource, j + 1, 1)) Mod 16) * 4 + 1, 1)
strTempLine = strTempLine & "="
ElseIf (Len(strSource) Mod 3) = 1 Then
strTempLine = strTempLine + Mid(BASE64_TABLE, Asc(Mid(strSource, j, 1)) \ 4 + 1, 1)
strTempLine = strTempLine + Mid(BASE64_TABLE, (Asc(Mid(strSource, j, 1)) Mod 4) * 16 + 1, 1)
strTempLine = strTempLine & "=="
End If
End If
Base64_Encode = strTempLine
End Function