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Exchange 2003 server unable to send/receive emails

Hi i am having problem with sending/receiving emails on my server which started 2hrs before and i am trying to troubleshoot this to solution. Before any one posts here,
Here are the things which i checked,
SMTP service
IIS admin service
Microsoft Exchange information service
event viewer - application - no errors
Looked at Exchange system manager - queues - no emails stuck/pending

event viewer - system - error as follows:
with event id: 10009
Source: DCOM
DCOM was unable to communicate with the computer mx.google.com using any of the configured protocols.

I am using GFI mail security and mail essentials software as antispam and mail security

just to add:
when i sent my last to gmail all received is

Please note that a critical failure occurred on the sender's messaging system at

the virus scanning stage.

The sender should be notified and reference made to this tracking number:


> GFI Content Security.

Can you help me in this please as we are unable to send/receive any emails through our server both internally and externally.
2 Solutions
Raheman M. AbdulSenior Infrastructure Support Analyst & Systems DeveloperCommented:
Try: ipconfig /flushdns
Raheman M. AbdulSenior Infrastructure Support Analyst & Systems DeveloperCommented:
Suliman Abu KharroubIT Consultant Commented:
Please try to disable (exclude) antivirus and test ..
Creating Active Directory Users from a Text File

If your organization has a need to mass-create AD user accounts, watch this video to see how its done without the need for scripting or other unnecessary complexities.

Maybe a restart of GFI services  or the complete exchange server of course could help?
Is your internet working fine ?

Is your network proper ?

Try to ping the DNS and Gateway.
I have had a lot of issues with GFI software in the past and stopped using it.  If you cannot find a soultion I would contact GFI to see what they have to say.
SALinfoAuthor Commented:
I have tried all the above options and still no success. the last thing i contacted is GFI and they confirmed its because of their GFI mail security software all this happened. They have suggested me to upgrade to the latest version as the old one is having these sort of problems. I have upgraded to the latest version with which the issue got resolved. To identify this, if mails are not working all should be queued up in C:\program files\GFI\mail security\failed mails. when i found this i contacted GFI and they were able to help in this to get resolved.

Thanks  and i appreciate all the experts for their quick response.
SALinfoAuthor Commented:
checked with all the regular check ups before posting here and also looked at this website for similar problems.
I would like to thank EE for quick response and really appreciate this. EE is really helpful for some one who is in need of technical help.
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