SBS 2003 Exchange inbound emails recieve msg X-Postfix; delivery temporarily suspended: operation timed out

Here is the situation, emails working last week, today get a call no incoming mail, but outbound appears to be ok.

Client is running SBS 2003 with all relevant service packs installed. They have stopped receiving external emails. Client sent me a test email which arrived about 5 hours after sending. I sent one back and after 2 hours received a delayed msg. (see details.txt)  

I have also lost the ability to remote control the server, and cannot login to the router remotely. both of which I did 3 days ago.

I have got the client to restart the server twice

I tried to manually send a email to the server by telnet to mail.client.com.au on port 25 and use the Ehlo commands to manually send, was able to succesfully send a email as far as post fix was concerned. but when I asked the client if they received the email they advised me they hadn't.

When I tracert the external IP it hops through a number of servers and then times out,  12     *     mel-core02-ixnt.ispone.net.au [112.213.128.122]  reports: Destinat
ion host unreachable.

My question is if this is a ISP issue, as the client can access the internet and outbound emails appear to be working. I can't visit the site immediatey as they are pretty remote, anyone seen something like this? details.txt
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lakeofafricaAsked:
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lakeofafricaConnect With a Mentor Author Commented:
Update:
had to visit the client and found the problem. Client had changed there broadband plan, same ISP but different plan. Problem with this being the ISP no longer supplied static ip addresses.

The issue was compounded by the fact that they used Trend hosted email security (run by the previous support company) this hosted security facility checked emails for spam etc and forwarded them to the mail server, which had just had its IP changed. hence no emails.

Conclusion
Setup a new static IP with a new provider (en route)
Changed trend hosted security configuration to use new Public, DHCP assigned IP. (band aid fix)
began process to gain control over MX records and domain registration information(work in progress)
Billed client...
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lakeofafricaAuthor Commented:
Update: Completely forgot my troubleshooting skills and didn't check http://www.mxtoolbox.com/blacklists.aspx server had been blacklisted, I have requested this to be removed but have to wait a few hours before it propagates through and will confirm if emails are working

Now the only problem is lack of remote access to both the server and to the Netgear router.
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