Exchange Server 2013 not accepting email

Hi,

We can send email internally and send email out of out of the exchange server but the exchange server will not accept emails. I have checked with DATAPRO (Domain Host Service provider)  and they can see the message queue building at DATAPRO. DATAPRO tried restarting the email delivery but to no success. I have also tried restarting the email server and also restarting the Exchange Transport service but with no luck
EDGEDATA_ZAAsked:
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Simon Butler (Sembee)ConsultantCommented:
How much disk space is on the C drive?
Anything logged on the server?
Can you telnet in to the Exchange server and send email?

It sounds like classic back pressure.

Simon.
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EDGEDATA_ZAAuthor Commented:
Hi,

I see the server OS drive is getting quite full (we have 14 GB available). I know exchange creates large log files but I'm not sure the correct way to delete these files . our Exchange DB sits on a separate drive and we have 800 GB available on that drive.

Can you indicate the best way to clear these logs ?

Thanks
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EDGEDATA_ZAAuthor Commented:
sorry I also don't know where these logs are stored
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EDGEDATA_ZAAuthor Commented:
sorry for the multiple threads

We can send emails out the server no problem
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Simon Butler (Sembee)ConsultantCommented:
Don't delete logs manually.
They are flushed by the backup application. Are you doing Exchange aware backups?

14gb free - how large is the hard disk?

You need to do some testing - can you telnet in to the server and send an email. If you can, then the problem could be outside of your network.
You also need to check the event log for anything related to MS Exchange Transport.

Simon.
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EDGEDATA_ZAAuthor Commented:
We using Arc Serve D2D to run backs and they ran successfully last night.

The Hard Disk with OS is 450 GB (14Gb available) and Hard Disk with Exchange database is 900 GB (about 750 Gb Available) - we have 35 mailboxes

I can send email using the Outlook web Access internally to any mailbox and can also send to an external mailbox using the same method.  

I suspect its the storage aspect on the C Drive. as I get a this error in even log

EventID: 1040

The SMTP availability of the Receive connector Default was low (6 percent) in the last 15 minutes.
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galex66Commented:
There is a external tools for this problem.
This tool is on url : https://testconnectivity.microsoft.com/
It help you to verify all connection type for Exchange 2013
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EDGEDATA_ZAAuthor Commented:
HI,

Thanks we seem to be running again. I researched our backup and managed to truncate the older exchange logs from within the backup. this freed up about 300 GB on our C Drive and I just needed to wait for these logs to be removed from the backup program.

The emails seem to be following again

Many thanks for pointing me in the right direction as the back pressure was definitely the problem.
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Zacharia KurianAdministrator- Data Center & NetworkCommented:
Check your SSL cert, if it is expiring or not. Had a similar issue with one of my friends.

The event 1040 can be resolved as per the below link;

https://social.technet.microsoft.com/Forums/exchange/en-US/df190316-f821-45fd-b587-a68af41a2117/lowlogvolumespacemonitor-propertyvalue?forum=exchangesvradmin

Zac.
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EDGEDATA_ZAAuthor Commented:
The emails seem to be flowing again
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Simon Butler (Sembee)ConsultantCommented:
"The SMTP availability of the Receive connector Default was low (6 percent) in the last 15 minutes. "

The Hard Disk with OS is 450 GB (14Gb available)

That is the critical bit of information.
Back Pressure works on a percentage basis.

Do you have your logs on the same drive as the Exchange installation directory? (Therefore C?).
If so, what I would suggest that you do is you shrink the partition of C, and then create another partition with a new letter. Move the logs to that new partition - probably about 200gb would be fine.
Therefore your percentage will stay high, meaning mail will continue to flow, but if something goes wrong with regards to the backup, the logs cannot take all of the space, crashing the server, they will just dismount the database.

Simon.
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Seth SimmonsSr. Systems AdministratorCommented:
This question has been classified as abandoned and is closed as part of the Cleanup Program. See the recommendation for more details.
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