Default settinging will not allow me to recieve email from internet

Hello All, I've just installed exchange 2007 and I cant seem to get email from the internet. I have checked anonymous login etc. Under accepted domain I have When I add another accepted domain with the third option external relay. I can recieve email but everyone in world try's  to relay "Open Relay".
Looks like it turns into a big spam machine wth all those queues building.
So is there document that can show me how to make this work, this is not a special setup. I could do exchange 2003 with my eyes closed.
Any bone will be much appreciated!
Thx 2000
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ncallas2000Author Commented:
Ok Guys, All I can say is Daaa, I have been working to much.....I forgot to put in and External Relay for the domain under Organization Units /hub transport/accepted domain.

Hope this  helps some one burn both wicks!!!!

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