Exchange 2007 POP3 account Problem

Good Day..
Recently I have installed Exchange 2007 and working fine. Now i have enabled POP3 services and configured the account for outside user in outlook 2003/2007. They can send and receive e-mail in their company but unable to send outside worldlike yahoo, gmail...

when they send message, getting error below:
Your message did not reach some or all of the intended recipients.

      Subject:      RE: test mail
      Sent:      11/18/2008 8:46 AM

The following recipient(s) cannot be reached:

      'mahtabalam_dbi@hotmail.com' on 11/18/2008 8:46 AM
            550 5.7.1 Unable to relay

      'mahtabalam_dbi@yahoo.com' on 11/18/2008 8:46 AM
            550 5.7.1 Unable to relay
Kindly suggest me what should I do.
mahtab786_dbiAsked:
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JoWickermanCommented:
Hi mahtab786_dbi,

This might be an authentication issue. Has the Exchange been setup to allow Autenticated users to relay through this server?

You can have a look at:

http://msexchangeteam.com/archive/2006/12/28/432013.aspx

Cheers.
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mahtab786_dbiAuthor Commented:
As I mentioned above, This problem only with POP3 Account which is configured in Outside, Internal Users connected with exchange server can send and receive mail anywhere without any problem. so why am I facing problem with pop3 acoount only.

Kindly help on this issue.
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JoWickermanCommented:
Oooohhhh!!! Sorry, I didn't read correctly!

The issue here is that when you're users are outside the building and they try to send mail, the still try to use your Exchange server to send the mail. Being outside the LAN, the Exchange server do not recognize the IP address and "thinks" it's a spammer, thus will tell your clients that relaying is not permitted on the server.

The way to get past this:

1. Give the POP3 users VPN access to send mail.
2. Create a rule on your firewall to allow certain IP addresses to relay mail through your Exchange
3. Change the POP3 user's sending options to use the ISP's SMTP server when sending mail.

Cheers.
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mahtab786_dbiAuthor Commented:
Thanx for suggestions...........but before that I had already configured POP3 account on Exchange server 2007 to other customer and working fine.
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JoWickermanCommented:
Strange. Is the other customer's Exchange open for relay?

When outside the building, POP3 receive will work, but sending should not work unless relaying is open on the server.
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mahtab786_dbiAuthor Commented:
ok...Really thanx for important information.....so if customer want to use pop3 account service of exchange server then what should do...........can u explain please...........
Thanx in advance...........
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JoWickermanCommented:
Hi,

The way you setup this server is 100%. I would do exactly the same with future servers, but would also make sure OWA works and see if you can implement VPN. This is a reaqlly valuable resource for emplyees to have.

To test your Exchange servers for open replay, you can use this:

http://www.checkor.com/

This will help you quite a lot.

Cheers.
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JoWickermanCommented:
Hi,

Are you happy with the solution? If so, you can close the question and award points.

Cheers.
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