Change SMTP security requirements for Exchange 2007 to not require SSL

I have just installed a Small Business Server 2008 network and the client has been using a CRM program that previously used an external SMTP server to generate mass amounts of emails to clients. The software now has to be adjusted so that it is sending out via an account on the SBS08 server. Unfortunately it only has options for server name, username and password, with no option for SSL or port numbers.

I am currently getting SMTP 550 5.7.1 errors about not being allowed to relay as the current user.

So I have to change the email sending requirements in Exchange to not require SSL connections, to accept via the default port of 25, and use plain text authentication. I went into Server Configuration > Hub Transport > Receive connectors > Windows SBS Internet Receive connector, but I'm not sure if I'm changing settings in the correct area and I don't want the server open to relaying. Any assistance would be appreciated.

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I would create a new recieve connector that allows the needed authentication from their IP or IP range. Make sure to check the allow anonymous on the last tab.
This post goes in to detail on how to create a receive connector to allow relaying by certain IP addresses:

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smickellAuthor Commented:
Thank you.
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