I follow a format similar to the first code posted.
The only thing I see in the second posted code is no quotes on the server name.
-smtpServer smtp.qwerty.org 
That could have been a copy and past thing but in my code this is my server reference.
$smtpserver = "mailserver.your_domain.com" #local relay server
the standard format I use when sending files.  I can include the sql and build csv file if you want it but not 100% on topic.
{
$filename = "D:\Powershell\Results\closed_request.csv"
$smtpserver = "mailserver.your_domain.com" #your server
$msg = new-object Net.Mail.MailMessage
$att = new-object Net.Mail.Attachment($filename)
$smtp = new-object Net.Mail.SmtpClient($smtpServer )
$msg.From = "mail_admin <donotreply@your_domain.com>"
$msg.To.Add("Customer Service <customerserviceoffice@your_domain.com>")
$msg.Cc.Add("real name <some.emailaddress@your_domain.com>")  # add a cc address like yourself so you can call BS when they say you didn't get it.
$msg.Subject = "Your request has been closed."
$msg.Body = "Hello, I closed your request. If you want a detailed explanation. Please see the attached file."
$msg.Body += "Thank you aaaaaand what not"  # add a second body line
$msg.Attachments.Add($att)
$smtp.Send($msg)
Remove-Item D:\Powershell\Results\closed_request.csv
exit
}
I hope that helps.