Exchange 2010 unable to receive e-mails


As from this morning we are unable to receive e-mails externally. All internal e-mail is fine.

We are running SBS 2011.

MX Records are point to the server. I can't see any major error messages appearing in the Event Viewer.

I have re-run 'Set Up your Internet Address' but no good. I tried Telenet 25 and that has responded OK.

Is there anything else I can check to see what the problem is?
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Check router is forwarding port 25 to the correct address?
MattTonerAuthor Commented:
Yes I've checked that and restarted router as well
Muzafar MominCommented:
check the relay setting on smtp, also can you post the error message that r recived while sending emails  from outside domain (gmail,yahoo, etc)
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how the email come to your server, are you using any spam filter. Please check it
also is there any error message which sender get while sending email to your domain
MattTonerAuthor Commented:
I think I found the problem which I'm not sure if it had anything to do with it.

I found out that the C:\inetpub\logs\LogFiles\W3SVC1572271583 contained 276Gb worth of log files, literally filled up the whole C:\ Drive. I trimmed it down to 30 days, restarted Exchange and mail is slowly coming through.

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Simon Butler (Sembee)ConsultantCommented:
That was the cause. Back pressure. Exchange stops processing email when free disk space drops below a certain level. IIS logs are the usual cause of rapid drop in space.

A little late but will give some more info.

Yes your problem has because the lack of space on the hard drive.

Please note this is the system hard drive, your files can and should be located somewhere else.

To prevent this issue you can assign a different place for your logs and monitor the space manually or automatically. You can also setup some kind of script to run every certain amount of time to wipe clean the "logs Disk" not before you make a backup with the 30 days worth of logs.  :-)
MattTonerAuthor Commented:
Deleting log files
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