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Setting up Exchange 2010 with Mail Security using my registered domain MX record

turboizzy
I have been trying to find a solution for this for the last two days and has been driving me crazy.

So I have an astaro firewall setup and running smoothly, the external interface is  a DSL connection and this updates my domain hostname ip address automatically via a DynDns Service. Here's my DynDns host info:

Mail Exchangers:  mniexchange01.mnisystems.co.uk


mnisystems.co.uk  A-record
mniexchange01.mnisystems.co.uk  A-record
www.mnisystems.co.uk

I have setup Microsoft Exchange 2010 on Server 2008 R2 and it is working properly internally as internal clients are able to send and receive emails without any problems. I cannot however send or receive emails to external addresses. Any help would be greatly appreciated.


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    It depends.  If this is a home type of connection, most major ISPs actively block direct SMTP connections to keep users from running their own mail servers.  If you want it unblocked, you would need to spend the extra $100-$200/month and get a business-class connection.  In the US, I know that Comcast Cable, Verizon DSL, and Frontier DSL all do this.
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    It depends.  If this is a home type of connection, most major ISPs actively block direct SMTP connections to keep users from running their own mail servers.  If you want it unblocked, you would need to spend the extra $100-$200/month and get a business-class connection.  In the US, I know that Comcast Cable, Verizon DSL, and Frontier DSL all do this.
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