RE: Problem: SMTP traffic is possible only through back-end Exchange

  • From: "Deshwal, Chand" <CDD@xxxxxxxxxxxxx>
  • To: "[ExchangeList]" <exchangelist@xxxxxxxxxxxxx>
  • Date: Tue, 19 Apr 2005 16:49:48 +0530

Configure front-end as the Smart Host in the SMTP properties of
Back-end. Now all the e-mails, from back-end will be forwarded to
front-end for all the external domains.


-----Original Message-----
From: Mustafa Cicek [mailto:mbcicek@xxxxxxxxx] 
Sent: Tuesday, April 19, 2005 4:23 PM
To: [ExchangeList]
Subject: [exchangelist] Problem: SMTP traffic is possible only through
back-end Exchange

We deployed Exchange 2003 (front-end and back-end).
Our front-end Exchange is also Exchnage proxy server (for RPC over
We use connector (DNS option) and defined only and only front-end
Exchange as Bridgehead server in the Exchange organization. Front-End is
responsible for all SMTP traffic.

We have the problem that not front-end Exchange, but back-end exchnage
tries to send mails to external domains. If we send mails to external
domains we found out that only back-end Exchange has these mails in its

It worked all well until last week. Last week we installed the following
security update for Exchange:
"Microsoft Security Bulletin MS05-021
Vulnerability in Exchange Server Could Allow Remote Code Execution

How can we tell the Exchange that only and only front-end smtp server
should connect to external domains?

Best Regards

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