$server = "."
$uid = "sa"
$db="master"
$pwd="数据库sa密码"
$mailprfname = "test" ---需要跟select name FROM msdb.dbo .sysmail_profile一致
$recipients = "接收邮箱，多个用；隔开" 
$subject = "邮件标题"
$computernamexml = "E:\powershell\computername.xml"
$alter_xml = "E:\powershell\cpdisk.xml"
$pwd_xml = "E:\powershell\pwd.xml"
function GetServerName($xmlpath)
{
  $xml = [xml] (Get-Content $xmlpath)
  $return = New-Object Collections.Generic.List[string]
  for($i = 0;$i -lt $xml.computernames.ChildNodes.Count;$i++)
  {
    if ( $xml.computernames.ChildNodes.Count -eq 1)
    {
      $cp = [string]$xml.computernames.computername
    }
    else
    {
      $cp = [string]$xml.computernames.computername[$i]
    }
    $return.Add($cp.Trim())
  }
  $return
}
function GetAlterCounter($xmlpath)
{
  $xml = [xml] (Get-Content $xmlpath)
  $return = New-Object Collections.Generic.List[string]
  $list = $xml.counters.Counter
  $list
}
function Getpwd($xmlpath)
{
  $xml = [xml] (Get-Content $xmlpath)
  $returnpwd = New-Object Collections.Generic.List[string]
  for($i = 0;$i -lt $xml.pwd.ChildNodes.Count;$i++)
  {
    if ( $xml.pwds.ChildNodes.Count -eq 1)
    {
      $pw = [string]$xml.pwd.password
    }
    else
    {
      $pw = [string]$xml.pwd.password[$i]
    }
    $returnpwd.Add($pw.Trim())
  }
  $returnpwd
}
function CreateAlter($message)
{
  $SqlConnection = New-Object System.Data.SqlClient.SqlConnection 
  $CnnString ="Server = $server; Database = $db;User Id = $uid; Password = $pwd"
  $SqlConnection.ConnectionString = $CnnString 
  $CC = $SqlConnection.CreateCommand(); 
  if (-not ($SqlConnection.State -like "Open")) { $SqlConnection.Open() } 
  
  $cc.CommandText=
      " EXEC msdb..sp_send_dbmail 
       @profile_name = '$mailprfname'
      ,@recipients = '$recipients'
      ,@body = '$message'
      ,@subject = '$subject'
      "
  $cc.ExecuteNonQuery()|out-null 
  $SqlConnection.Close();
}
$names = GetServerName($computernamexml)
$pfcounters = GetAlterCounter($alter_xml)
$upwd = Getpwd($pwd_xml)
$report = ""
for($m=0;$m -lt $names.count;$m++)
{
$cp=$names[$m]
$p=New-Object -TypeName System.Collections.ArrayList
$uname="administrator"--因为取的服务器用户名都是administrator，如果每台机器不一样，可以放在XML等文件中读取
$pw=$upwd[$m]
$upassword=convertto-securestring $pw -AsplainText -force;
foreach ($pfc in $pfcounters)
{
  $filter="deviceID='"+$pfc.get_InnerText().Trim()+"'" 
  #$Disk =get-wmiobject win32_logicaldisk -computername $cp -Filter $filter
  #$counter=$Disk.Freespace/1024MB
  $cred=new-object system.management.automation.PSCredential($uname,$upassword);
  $counter=(get-wmiobject -credential $cred -class win32_logicaldisk -computername $cp -filter $filter).Freespace/1024MB
  $total=(get-wmiobject -credential $cred -class win32_logicaldisk -computername $cp -filter $filter).Size/1024MB
  #$pfc = $pfcounters[$i]
  $path = "机器名："+$cp+"; 盘符："+$pfc.get_InnerText()
  $diskFree=";总磁盘空间大小为:"+[math]::truncate($total).ToString()+"G;当前剩余空间大小为："+[math]::truncate($counter).ToString()+"G!"      
  $item = "{0} {1} " -f $path,$diskFree
  $report += $item + "`n"        
}  
   
}
$report
if($report -ne "")
{
  CreateAlter $report
}

computername>
    computername>
    test
    /computername>
/computernames>

Counters>
    Counter>C:/Counter>
    Counter>D:/Counter>
/Counters>

pwd>
    password>
     helloworld 
    /password>
pwd>