i have a web server , and i use Bulk Email Program (World Cast) to send emails to my customers and members of my site (they are over 45000 ) but when i use my site's SMTP Server the sending stop after 3000 message (or around)
the following message appear :
550-Host XXXX.com [184.108.40.206] is not permitted
550-to relay through server1.MySite.com.
550-Perhaps you have not logged into the pop/imap server in the last 30 minutes.
550-You may also have been rejected because your ip address
550-does not have a reverse DNS entry.
550 relaying to <Email@Email.com> prohibited by administrator
any one can help !