SBS2008 - Mail flow issue

Hey guys,

I've got a client with SBS2008 6GB RAM Exchange 2007 SP3  - which i just updated

The server keeps complaining about Mail Submission , and mail flow stops until your restart Mail submissions and transport services.
Restarting the server makes not difference


I've checked and there is no back pressure, the RAM usage is slighty high 82%


The Microsoft Exchange Mail Submission Service is currently unable to contact any Hub Transport servers in the local Active Directory site. The servers may be too busy to accept new connections at this time.


Service MSExchangeMailSubmission.  Unable to process anything for over 30 minutes.  Diagnostic info: Governor: Governor for DatabaseManagerEvent, Last run time: 02/09/2016 13:02:20, Next retry interval: 00:05:00.  Current exception: Microsoft.Exchange.Assistants.TransientServerException
   at Microsoft.Exchange.Assistants.Util.CatchMeIfYouCan(CatchMe function)
   at Microsoft.Exchange.Assistants.Base.CatchMeIfYouCan(CatchMe function)
   at Microsoft.Exchange.Assistants.EventDispatcherPrivate.DangerousProcessItem(EmergencyKit kit, InterestingEvent interestingEvent)

I have increased Concurrent connections but that makes the situation worse
https://technet.microsoft.com/en-us/library/bb676561(v=exchg.80).aspx


Any other ideas?
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DeepinInfrastructure Engineer Asked:
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DeepinInfrastructure Engineer Author Commented:
Thanks guys.

Turned out to be the Kaspersky Antivirus - disabled it from starting up and no more mail submission problems
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Cris HannaCommented:
When you say there is no back pressure, what is the size of your C: drive and how much free space there?

6GB of RAM is woefully underpowered for SBS

My first two recommendations
1. Run the Fix My Network Wizard
2. Run the SBS 2008 Best Practice Analyzer
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Alan HardistyCo-OwnerCommented:
If you want to be 100% sure BackPressure isn't the problem, please read my article and apply the quick fix:

https://www.experts-exchange.com/articles/4259/Exchange-2007-2010-Backpressure-Quick-Fix.html

Once you know it's not that, then we can help you look at other things, but it does sound quite likely from what you've said.

Alan
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