New Exchange 2007 | Not able to receive any incoming emails

Hi Experts,

I setup a new Exchange server 2007 from scratch. Im able to send email out but not able to receive any emails.

(NAT)Port 25 is open in the firewall.

No issues in firewall.

When I send any emails out im able to receive it in my gmail

But if i send from gmail to exchange i get an gmail error

Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 530 530 5.7.1 Client was not authenticated - on relay of: MAIL FROM:XX@GG.Com (state 14).
gs1ukAsked:
Who is Participating?
 
WhatWhyITCommented:
yes, It is normal to have the recieve connector set to anonymouse, you never know who is going to send you mail.
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gs1ukAuthor Commented:
If I change my Receive Connectors Permissions Groups to Anonymous it works.

Is it normal to leave it open like that is there any hardening
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WhatWhyITCommented:
The exception to this is if you only want to recieve mail from a single host or smart host or a particular domain, IP range or what ever.
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