$mailSMTPServer = "smtp.<server>.com"
$cred = Get-Credential
$mailSMTPUser = $cred.GetNetworkCredential().username
$mailSMTPPass = $cred.GetNetworkCredential().password

$Message = New-Object System.Net.Mail.MailMessage
$Message.From = $routlook.CurrentUser.Name + "<"+ $routlook.CurrentUser.SMTPAddress+ ">"
$Message.To.Add("recipient@hotmail.com")
$Message.Subject = "Confirmation"
$Message.IsBodyHtml = $true
$Message.Body = "Thank you for the mail. I'm confirming I have recieved it"
$Message.Sender = $routlook.CurrentUser.SMTPAddress

$SMTPClient = New-Object System.Net.Mail.SmtpClient( $mailSMTPServer)
$SMTPClient.Credentials = New-Object System.Net.NetworkCredential($mailSMTPUser, $mailSMTPPass)

$SMTPClient.Send($Message)