檢查郵件伺服器是否有效
private function getmailserver(byval sdomain as string) as string
dim info as new processstartinfo
dim ns as process
'呼叫windows的nslookup命令，查詢郵件伺服器
info.useshellexecute = false
info.redirectstandardinput = true
info.redirectstandardoutput = true
info.filename = "nslookup"
info.createnowindow = true
'查詢型別為mx。關於nslookup的詳細說明，請參見
'windows幫助
info.arguments = "-type=mx " + sdomain.toupper.trim
'啟動乙個進行執行windows的nslookup命令()
ns = process.start(info)
dim sout as streamreader
sout = ns.standardoutput
' 利用正規表示式找出nslookup命令輸出結果中的郵件伺服器資訊
dim reg as system.text.regularexpressions.regex = new system.text.regularexpressions.regex("mail exchanger = (?[^///s]+)")
dim mailserver as string
dim response as string = ""
do while (sout.peek() > -1)
response = sout.readline()
dim amatch as system.text.regularexpressions.match = reg.match(response)
if (amatch.success) then
mailserver = amatch.groups("server").value
exit do
end if
loop
return mailserver
end function
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