Mail flow completely broken after upgrading Exchange Server 2013 CU3 (Build 775.38) to Exchange Server 2013 SP1 (Build 847.32)

Question

internal mail flow completely broken.
external mail flow completely broken.
i upgraded exchange server as follows:
1. setup.exe /PrepareSchema /IAcceptExchangeServerLicenseTerms
2. setup.exe /PrepareAD /IAcceptExchangeServerLicenseTerms
3. upgraded the exchange server with GUI installer
also considered this: http://support.microsoft.com/kb/2938053/en-us
receive connectors :
Transport Service couldn't start, then i disabled hub transports, and it starts, but no mail flow on port 25. according to this:
http://social.technet.microsoft.com/wiki/contents/articles/24056.what-the-crash.aspx
i didn't have any success to fix mail flow, any solution?

Answer 1

Hi Alireza
The above tech-net http://social.technet.microsoft.com/wiki/contents/articles/24056.what-the-crash.aspx
will be applicable only if we get these events in the app log 1019,1018,1036,4999
You can check the transport service is running in which service account - Local or network 
It should be running in network account by default.
You can run get-transportagent and check if there are any transport agents installed 
If you find them then disable all the transport agents that you have installed on the Exchange servers by running disable-transportagents
Disable the antivirus if you have any installed.
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