Getting Email Errors possibly you know whats up

well when someone registers on my website or sends me a email this is the problem i get on occasion.

:
Sorry, I wasn't able to establish an SMTP connection. (#4.4.1)
I'm not going to try again; this message has been in the queue too long.

--- Below this line is a copy of the message.

check your logs, specifically check for high loads on the server. Most servers are configured so that if the load goes above 10 it starts shutting down some of its services, the first one to be shut down is usually mail.

If your server is running at this high of a load, you have a serious problem with either renegade scripts, too much traffic / processing for your server's hardware, or you have a poor quality server.

cheers,
Luke

thanks luke the whole site is being changed..

Matt..