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550 5.7.1 Unable to relay for email@domain.com

Hey everyone,
I'm reaching out here... this has been driving up the wall the last few weeks, as well my users.  I have exchange 2003 running on 03 server, in a single domain, multiple domain controller network. Everything works great for people who access email from inside regardless if they use Outlook or OWA.  Everything works fine for people using OWA from the outside.  Problem comes in when people from the outside use POP.  They can only send email to within the company.  I have enabled relay for all authenticated users.  I have tried everything, on the remote POP machines i checked off, my outgoing server requires authentication, and on the server side.I'm not sure what additional information i should provide.  There are tons of things regarding this on the web but i cant find any resolution.  I found that you can add each domain who users can send email to, but realistically we have thousands of customers.  Any help would be GREATLY appreciated.

Best regards,
Alex
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alex-is
Asked:
alex-is
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1 Solution
 
rhandelsCommented:
Hi,

>> I have enabled relay for all authenticated users.  I have tried everything, on the remote POP machines i checked off, my outgoing server requires authentication, and on the server side.I'm not sure what additional information i should provide<<

This should be working. There is no need to give all the users acces to relay. We have the same setup and it works. First off all try installing SP1 for Exchange 2003.. Second of all, just as a test, make sure to give all machines access to relay, this way you can make sure that it really is a permissions problem..

Are these users mailbox enabled users?? Make sure that the setting "use same credentials as the incoming server" on the "my outgoing server requires authentication".
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George SasIT EngineerCommented:

Tell ALL those users that use POP3 / SMTP to authentificate with the SMTP server before they send mail.
This will solve the problem.
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alex-isAuthor Commented:
I have tried everything except  SP1.

i will let you know how it goes,

thanks
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George SasIT EngineerCommented:
Are you SURE that they are authentificating against the smtp/pop3 server ???? as this is the message you will get.
On the SMTP server require authentification and say allow all authentificated users to relay trough the server.
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alex-isAuthor Commented:
just to make sure..

AD>EXCHANGE>Administrative Group>Servers>SERVERNAME>PROTOCOLS>SMTP>DEfault SMTP virtual server>[properties]>[Access tab]>RALAY>Allow all computers which successfully authe..... is checked off.

is this the option?

thanks
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George SasIT EngineerCommented:
Has to be ON.
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alex-isAuthor Commented:
opps... i appologise... checked off, i mean.. it's checked. it's ACTIVE
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rhandelsCommented:
Indeed, but that's not the only thing you need to check, make sure to go POP3 clients use the "TYhis server requirwes authentication" on the POP3 client, are you sure this is checked??
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George SasIT EngineerCommented:
Be sure that you have this covered on the SMTP Server properties:
Authentification:
Anonymous Access - enabled
Basic Auth  - Enabled
Integrated Windows Auth - Enabled

Connection:
All Except the list below - Checked

Relay :
Only the List below - checked
and add the local machine and the IP range of your Domain (This is how I have it set)
Check - Allow All computers wich .....

Delivery > Outbound Security :
Allow Anonymous.
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