RE: External User cannot send mail

  • From: "Thomas W Shinder" <tshinder@xxxxxxxxxxxxxxxxxx>
  • To: "[ExchangeList]" <exchangelist@xxxxxxxxxxxxx>
  • Date: Mon, 27 Oct 2003 18:00:25 -0600

Hi Qusai.

Are you using an SMTP relay?

Check out the ISA Server 2000 Exchange 2000/2003 Deployment Kit for
details on how to make the ISA Server firewall into an authenticating
SMTP relay.


Thomas W Shinder 
ISA Server and Beyond:
Configuring ISA Server:


-----Original Message-----
From: Qusai Ali AL Haddad [mailto:qusai@xxxxxxxxxxxxxx] 
Sent: Monday, October 27, 2003 9:57 PM
To: [ExchangeList]
Cc: isalist@xxxxxxxxxxxxx
Subject: [exchangelist] External User cannot send mail

Dear all 
i have exchange 2003 
internal users can send email to each other and to outside 

i have external users cannot send email to other Domains 
.. but they can send within the domain ... 
when they are sending to other domains .. they are getting 
Unable to relay 550.. 

any help 

thanx alot 


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