title: SMTP outbound emails stuck in Queue folder : Windows XP SP3, IIS 5.1
body: <p>I am using a PHP script for sending emails by IIS 5.1 SMTP.
  The emails, go to outbound folder. really path is <code>C:\Inetpub\mailroot\Queue</code>.
  after a seconds, it start to send emails properly, but after sending 5 or 6 emails, it stops to send the other ones. SMTP service is still start and it seems there is no problem to SMTP service.
  but,If i restart the service, it sends 1 or 2 other emails and then, it stops again.
  I mean sending emails stop but service is start.
  by the way, emails are stucked in <code>Queue</code> folder.
  Also i checked <code>Badmail</code> folder. it is empty</p>
  
  <p>Thanks</p>