psmtp.COM cause server hang? Please help!

Hi,

When our server send mails to a psmtp.COM domain, it will freeze. It happens again even if we reboot the server. The only solution is to delete that mail.

The same problems repeatedly occur. Any idea about this? Here is the last message each time before the server hang:

"Router: Message 000D9376 NOT transferred via SMTP to (receiver domain).mail5.psmtp.COM for (receiver name)@(receiver domain) from (MyUser)

Size: 84k 451 Can’t connect to (receiver domain) - psmtp.

P.S. We are using Domino 6.0.4 on Win2000 server.

Thanks & Regards,

Eric