Quote:
Originally Posted by fathianf  "The server does not support a SSL connection. Account: 'mail.iut.ac.ir', Server: 'mail.iut.ac.ir', Protocol: SMTP, Server Response: '250 DSN', Port: 25, Secure(SSL): Yes, Server Error: 250, Error Number: 0x800CCC7D" |
That my, or may not, be a problem. When I check your DNS records from here I find that you have multiple mail servers with the same MX priority that
resolve to different IP addresses, this is definitely not a good idea as the user can end up at a different mail server than the one you intended. You need to fix that before you can make a diagnosis of your problem.