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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