asp IsValidEmail 验证邮箱地址函数(email)

'********************************************
'函数名：IsValidEmail
'作 用：检查Email地址合法性
'参 数：email ----要检查的Email地址
'返回值：True ----Email地址合法
' False ----Email地址不合法
'********************************************
Public Function IsValidEmail(Email)
Dim names, name, I, c
IsValidEmail = True
names = Split(Email, "@")
If UBound(names) > 1 Then IsValidEmail = False: Exit Function
For Each name In names
If Len(name) = 0 Then IsValidEmail = False:Exit Function
For I = 1 To Len(name)
c = LCase(Mid(name, I, 1))
If InStr("abcdefghijklmnopqrstuvwxyz_-.", c) = 0 And Not IsNumeric(c) Then IsValidEmail = False:Exit Function
Next
If Left(name, 1) = "." Or Right(name, 1) = "." Then IsValidEmail = False:Exit Function
Next
If InStr(names(1), ".") = 0 Then IsValidEmail = False:Exit Function
I = Len(names(1)) - InStrRev(names(1), ".")
If I > 2 And I > 3 Then IsValidEmail = False:Exit Function
If InStr(Email, "..") > 0 Then IsValidEmail = False
End Function