Not receiving email exchange 2007

I have a Windows server 2008 SBS with Exchange 2007 I can open Outlook and see my email, I can send email but all of a sudden incoming email is not working. I can ping my mx record mail.company.com and IP is correct, I have a broadband provider and the ports are open, exchange is up to date, windows server is up to date, no errors.I restarted the server, the cable modems, I checked my antispam and is working fine. I raised the database size limit in the registry. I am at a lose of words, I have no clue what is going. I have never seen this before. Nothing is sitting in the queue either.
Matthew GalianoCTOAsked:
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Dave StringfellowConnect With a Mentor IT managerCommented:
ok, so try this:

telnet mail.company.com 25
helo comapny.com
mail from: user@company.com
rcpt to: user@company.com
data
Test
.

(remember the full stop on the new line)

What response do you get?
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Dave StringfellowIT managerCommented:
Can you telnet to your mx record? (in case you dont know: cmd    telnet mail.company.com 25

What response do you get?
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Matthew GalianoCTOAuthor Commented:
220 servername.domain.local microsoft esmtp service ready date and time.
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Matthew GalianoCTOAuthor Commented:
oh and -0400
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sunnyc7Connect With a Mentor Commented:
Go here
start > run > eventvwr
Under Windows Logs
Go to application

Copy paste the event errors from there.
I am looking for MsExchangeIS errors

Are there any errors with eventID 15000 and onwards ?

Please post back
--

Also go here and test it remotely
www.testexchangeconnectivity.com/
Test for inbound SMTP
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ZupremeConnect With a Mentor Commented:
1) Send a test email between two users within your environment
2) Send an inbound test message from your 3rd party spam filtering service of from your spam filtering appliance (if applicable)
3) Run the mail flow troubleshooter in Exchange Console
4) Run the message tracking wizard

Respond with results.
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Matthew GalianoCTOAuthor Commented:
Thank you for your help, I appreciate it.
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