Hi All,I am in Exchange 2007. Its installed, configured. But before finally deploying it for my organization, I want to be sure almost everything. My email system is working fine without any problem. But I am trying to understand which service is actually flowing my all email of users. SMTP or Sendconnector (Under Organization Configuration/Hub Transport->Sendconnector)or Receive Connector (Under Server Configuration/Hub Transport->Receive Connector). According to guideline, for Internal email sending or receiving, SMTP (from server)or Receive Connector+ Send Connector (From Exchange itself) works. What I did, disable both Send and Receive connector. My mail is still going and receiving. So I thought SMTP is doing that. But I even did not install 'SMTP Server' feature in my Exchange Server Box. Okay I tried again justStop the IIS. Still my mail is going and receiving.More informations is, I am the scenario of a single Exchange organization. So all I need is to stop any mail flowing then check no internalemail is going and receivingthen turn that flowing on again. Please help. Thanks.

Hi,Exchange 2007 has its own SMTP stack, it doesn't use Windows Server SMTP service. Its the job of Hub Transport server role of Exchange 2007 to perform mail routing. I assume you have installed all roles on same server. You can stop the Microsoft Exchange Transport service, this will stop the email flow.In send connector you will define how your email will go to internet (For e.g. DNS or SmartHost). Its the same as SMTP connector in Exchange 2003.In receive connector you will define, how Exchange will accept SMTP connections (permission, authentication, port, network etc.). It does almost thesame job as SMTP virtual server in Exchange 2003.HTH...-V

As v-beta said, it uses its own SMTP stack to communicate. CAS/Mailbox/Unified Messaging communicate with Hub Transport server through MAPI RPC. Hub Transport to Hub Transport server in other AD site or to internet goes through SMTP, hub transport role uses send and receive connector to define topology besides of AD Sites for internal mail flow routing... Below Exchange Server ComponentArchitecture gives you better idea on how all components workstogether... Exchange Server 2007 Component Architecture http://www.microsoft.com/downloads/details.aspx?FamilyID=FDCDF6E5-DE47-4B58-8086-282101BCDDE9&displaylang=en Amit Tank | MVP Exchange Server | MCITP: EMA | MCSA: M | http://ExchangeShare.WordPress.com

Hi v-beta,Thanks for your reply. Yess when I stoped Microsoft Exchange Transport service, it stop flowing all email. But with send connector disabled, my mail is still going outside of the organization. From my internal mail, my mail is going to yahoo / hotmail. But its the send connector which only should define how mail will go to internet. I dont have any edge connector setup. Anyidea ? Thanks,Monir

Hi Amit,Thanks for the big helpfull pdf file. But I dont understand one thing. Without any edge subscription, how a email is going out ? My send connector is disabled. No edge subscription rules has defined. But I can send email to yahoo or hotmail. Please help.Thanks,Monir

Did you restart the Transport Service? It may become effective after restarting it... :)Amit Tank | MVP Exchange Server | MCITP: EMA | MCSA: M | http://ExchangeShare.WordPress.com

Thanks Amit. I have tried last Friday stoping and it worked and so I put v-beta as answer. But it was stoping all email. Now its work fine by arestart of a service. Its not stoping my internal but stoping external email which I was looking for. Thank you very much for your help Amit.

You're welcome Monir!... :)Amit Tank | MVP Exchange Server | MCITP: EMA | MCSA: M | http://ExchangeShare.WordPress.com