vba为什么没有调用我写在程序里的sendusingaccount账号发送邮件，还是用了我默认的账号呢件

Sub SendEmail()
  Dim OutlookApp As Object
  Dim OutlookItem As Object
  Set OutlookApp = CreateObject("outlook.Application")
  Set OutlookItem = OutlookApp.CreateItem(olMailItem)
  Sheets("Senemail").Select
  Receiver = [b1].Value
  Receiver2 = [b5].Value
  SubjectTex = [b2].Value
  BodyText = [b3].Value
  AttchadObject = [b4].Value
  
On Error GoTo SendEmail_Error
   With OutlookItem
        .SendUsingAccount = "northordercn@outlook.com"
        .To = Receiver
        .CC = Receiver2
        .Subject = SubjectText
        .Body = BodyText
        If AttchadObject <> "" Then
        .Attachments.Add AttchadObject
        End If
        .Send
  End With
SendEmail_Exit:
  Exit Sub
SendEmail_Error:
  MsgBox Err.Description
End Sub
为什么没有调用我写在程序里的sendusingaccount账号发送邮件，还是用了我默认的账号呢

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