Creating a relay account in Exchange 2010

Hello
I've installed any exchange 2010 server with CAS, HUB, MBX roles. No edge transport role yet.
Migrated mailboxes from exchange 2003. Front end and Backend legacy servers are offline.
We have users on a few different subnets.
1. subnet with full access to exchange.
2. subnet with smtp/pop access to exchange.

Some of our users have external pop3/smtp emails setup. Then can receive pop3 but cannot send.

Running the command Get-ReceiveConnector "Blahblahsubnet2" | Add-ADPermission -User "NT AUTHORITY\ANONYMOUS LOGON" -ExtendedRights "ms-Exch-SMTP-Accept-Any-Recipient"

Allows the users to send e-mails and everything works (aslong as they are using that connector). This is Open relay as I understand it. I would not like to use this method.

I have been trying to use "outgoing smtp server requires auth" setting in outlook2003 and using a domain account with mailbox (not sure if the user requires a mailbox) so they have to authenticate with that account,  but they always get Client does not have permissions to send as this sender". I've tried right clicking the mailbox and selecting Manage Send As Permission and adding NT Authority\Anonymous logon + Everyone

I do not know a lot about Exchange and feel I lack some fundamental understanding how Exchange works and just trying stuff from googling isn't solving anything.

Is there a way to create a relay account for exchange 2010?
norwegiandudeAsked:
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Evotec-ITConnect With a Mentor Commented:
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Evotec-ITCommented:
Also this for enabling POP3 http://technet.microsoft.com/en-us/library/bb124934.aspx 
And this for enable POP3 for a User http://technet.microsoft.com/en-us/library/bb124934.aspx

Hope they help.
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norwegiandudeAuthor Commented:
Was hoping for abit more explaination then just a link.
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