E2K3 can't send email to E2K10 server. event id 7002

I'm getting a weird error. We still have an old exchange 2003 server (that at some point i hope to dismantle) that is pretty much on only because i have some developers who don't have the time to change the name to the new server in their scripts when sending emails. Right now they will connect to the E2K3 server which in turn should connect to the E2K10 server and send the email. Starting on 9-28 i am seeing errors like this:

This is an SMTP protocol warning log for virtual server ID 1, connection #29. The remote host "192.168.x.x", responded to the SMTP command "mail" with "452 4.3.1 Insufficient system resources  ". The full command sent was "MAIL FROM:<> AUTH=<>  ".  This may cause the connection to fail.

I am able to connect to the E2K10 server using telnet and to port 25 and send emails. Also, our internal and external mail is flowing fine. I think its something between the E2k# and E2k10 servers but im not sure what.

I also noticed that under Tools, Status in the E2K3 System Manager it says it can't reach the E2K10 server, even though its up and running.

Both servers have enough space and memory. Not sure what's happening.
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msidnamAsked:
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lciprianionutCommented:
Change in DNS the IP address of E2K3 to the E2K10 and shutdown the Exchange 2003 one. If everything is going fine you can remove it from your infrastructure so you don't need to stay after them.
Now back to your problem: did you tried a reboot ?
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msidnamAuthor Commented:
I rebooted last night but it hung during reboot so i had to hard boot it this morning. I went ahead and rebooted it again and the emails started to come through.

So strange.
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