如何使用 PowerShell 发送电子邮件

我想从 PowerShell 发送电子邮件， 所以我使用这个命令：

$EmailFrom = "[email protected] /cdn-cgi/l/email-protection"
$EmailTo = "[email protected] /cdn-cgi/l/email-protection"  
$Subject = "today date"
$Body = "TODAY SYSTEM DATE=01/04/2016  SYSTEM TIME=11:32:05.50"
$SMTPServer = "smtp.mail.yahoo.com"
$SMTPClient = New-Object Net.Mail.SmtpClient($SmtpServer, 587)   
$SMTPClient.EnableSsl = $true    
$SMTPClient.Credentials = New-Object 
System.Net.NetworkCredential("[email protected] /cdn-cgi/l/email-protection", "password")    
$SMTPClient.Send($EmailFrom, $EmailTo, $Subject, $Body)

此命令不适用于 Yahoo 邮件或 Outlook 邮件，但适用于我的 Gmail。 我做错了什么吗？

以下代码片段对我来说确实有效：

$Username = "MyUserName";
$Password = "MyPassword";
$path = "C:\attachment.txt";

function Send-ToEmail([string]$email, [string]$attachmentpath){

    $message = new-object Net.Mail.MailMessage;
    $message.From = "[email protected] /cdn-cgi/l/email-protection";
    $message.To.Add($email);
    $message.Subject = "subject text here...";
    $message.Body = "body text here...";
    $attachment = New-Object Net.Mail.Attachment($attachmentpath);
    $message.Attachments.Add($attachment);

    $smtp = new-object Net.Mail.SmtpClient("smtp.gmail.com", "587");
    $smtp.EnableSSL = $true;
    $smtp.Credentials = New-Object System.Net.NetworkCredential($Username, $Password);
    $smtp.send($message);
    write-host "Mail Sent" ; 
    $attachment.Dispose();
 }
Send-ToEmail  -email "[email protected] /cdn-cgi/l/email-protection" -attachmentpath $path;