It's amazing what a little checkbox will do.  Many thanks Andy for your help (and the 
others who replied).
 
It is working now.
 
Oh, for Exchange 2000!  How I wish I could upgrade this domain.   Oh well.
 
Thanks again.
 
Mike Strock
[EMAIL PROTECTED]

        -----Original Message----- 
        From: Andy David [mailto:[EMAIL PROTECTED]] 
        Sent: Sun 2/2/2003 09:56 
        To: Exchange Discussions 
        Cc: 
        Subject: RE: 550 errors
        
        

        IIRC, Checking "Hosts and Clients that successfully authenticate" is 
sufficient enough as well.
        
        
        ---------- Original Message ----------------------------------
        From: "knighTslayer" <[EMAIL PROTECTED]>
        Reply-To: "Exchange Discussions" <[EMAIL PROTECTED]>
        Date: Sun, 2 Feb 2003 17:46:07 -0000
        
        >Are they remote users where they VPN or dial in to your LAN ?
        >
        >Have you enabled POP3 support on your IMC and if so, have you configured
        >the IP addresses allowed to relay ?  Did you restart the IMC ?
        >
        >Ask yourself these questions and see how you get on.
        >
        >...knighTslayer...
        >
        >-----Original Message-----
        >From: [EMAIL PROTECTED]
        >[mailto:[EMAIL PROTECTED]] On Behalf Of Mike Strock
        >Sent: 02 February 2003 07:24
        >To: Exchange Discussions
        >Subject: 550 errors
        >
        >
        >I'm administering a 5.5 box, SP3 installed.  I've got a couple users who
        >have switched to using POP3/SMTP through this machine (they are remote
        >users now).
        >
        >They are getting a message when trying to send mail to users outside the
        >default domain of '550, relaying prohibited'.  I've had them set it such
        >that they have checked 'Server requires authentication' and had them put
        >in their username/password for the domain.
        >
        >One user is using Outlook Express, one is using Outlook 2000.
        >
        >How can I correct this?
        >
        >Thanks.
        >
        >Mike Strock
        >[EMAIL PROTECTED]
        >
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