Mavericks mail server stops distributing group email after a few hours of usage

I've been having problems with our Mavericks mail server ever since our upgrade with group mail.
The server will distribute group email for a few hour, then it simply stops working.
No error message, no bounces, and the server keeps the incoming mail in its incoming queue.
Restarting the mail services by either server.app or serveradmin mail stop; serveradmin mail start command like are the only way I can get it to continue to distribute the email. I suspect it has to do with postfix itself hiccuping? But this is a reproducable problem.
Mail filtering is on, score set to 6, 10 mb limit, spamhaus is active.
Looking for tips on how to stablize this service short of setting up cron job to restart the services every few hours.

I know this is not the fix you are looking for, but it's what I had to do, so I thought I'd share.
Hopefully, someone will be able to figure it out the "right" way!
I created this AppleScript that will stop and start the mail service every hour.
You can copy and paste it into AppleScript Editor, compile it and save it as an application. You can then run it. You need to run it from an administrator account and keep that user logged in.
If once an hour (every 3600 seconds) is too often, just change 3600 to however many seconds you want.
Be sure to change AdminPassword with the Admin user's actual password.
repeat
          do shell script "/Applications/Server.app/Contents/ServerRoot/usr/sbin/serveradmin stop mail" password "AdminPassword" with administrator privileges
delay 60
          do shell script "/Applications/Server.app/Contents/ServerRoot/usr/sbin/serveradmin start mail" password "AdminPassword" with administrator privileges
          delay 3600
end repeat

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Exchange 2013 stops receiving external email after about 8 hours

Hello,
Just installed 2013 excahnge server 3 days ago. We noticed after the first night that we did not receive any external emails throughout the night. I could not find anything wrong with receive connectors. Telnet works internally when this
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I dont know what to check or look for at this point. Very new to exchange 2013. Any kind of advice would be helpful at this time.
It is not a firewall issue. Same firewall and set of rules that we use for other/old mail servers. We only have 1 exchange server that has all roles.
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OK... Did alot of testing and spent some time with Microsoft's support on the phone.
I believe there is actually two problems going on in this thread.
1. Exchange 2013 Admins that have changed the default receive connectors are experiencing a conflict on the scope settings. Make sure that none of the receive connectors are using the same ports, and that you have not modified the security settings in anyway
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2. The Malware Agent has a flaw that is causing the the Microsoft Exchange Transport service to endlessly wait on the Malware Agent to process a message that it just can't handle. (Two reboots of the entire server may be needed to clear this, or sometimes
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The Microsoft technician had me perform a sequence of steps that highlighted this. To see if this is infact your problem you can perform the following steps.
A) Once the Exchange server stops processing messages, figure out the rough time it stopped processing messages.
B) Open the event viewer.
C) Under "Windows Logs", right click "Application", select "Filter Current Log...", check "Warning" and "Error", then click "OK".
D) Scroll down the log to the rough time that your Exchange Server stopped processing messages. You are looking for a slew of errors about the same time from "MSExchange Extensibility" (1051), "MSExchange Transport" (9201), "MSExchange
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E) So.... Open the Exchange Management Console and type "Disable-TransportAgent", followed by enter. It will prompt "Supply values for the following parameters:". Enter "Malware Agent", press enter again. Type "A",
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or
http://technet.microsoft.com/en-us/library/jj150526.aspx"
F) Go to run, enter "services.msc". On the window that opens, find "Micorosoft Exchange Transport" and restart it.
I know this is NOT a fix, but a work around that is less than desired as the Malware Agent is a filter to keep unwanted emails out. I highly recommend running some sort of 3rd party spam/Malware filter that has been fully tested to run with Exchange
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Microsoft is to contact me back once they can figure out why this is happening, and I believe in the end a patch for Exchange 2013 will be produce to correct the problem.
In the mean time.... don't waste your money on paying Micorosoft for support, as I have already done this.
For the individuals who say they are not experiencing trouble, I am going to go out on a limb here and say that either you have a 3rd party software program that is filtering the mail before it reaches the Malware Agent, you have disabled the Malware Agent,
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I have spent many hours trying to figure my problems with Exchange 2013 and I will not swear that my entire post is correct, but I have gotten very much closer to a stable mail server after much work. If you feel that anything is incorrect, please reply
back and let me know why, so that we may all benifit.
P.S. Sorry for the mis-spellings and what not, I am very tired at the moment, and was forced to use explorer, because this site is not liking Chrome at the moment. (Will not let me login)

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Mavericks mail server stops distributing group email after a few hours of usage

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