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Originally Posted by JamboUK
Not sure what you mean. The firewall is a relatively straightforward one incorporated in a Netgear DG834G.
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OK - I was assuming a more featured firewall.
First of all, to sort this out you need to access the SMTP/POP using a domain name - e.g. smtp.company.co.uk - then you need DNS entries to point to that to access them externally. Check out
http://www.dyndns.com/ for this.
I suspect that the firewall/router is doing your DHCP for you, and probably that it doesn't do much more than lease out local addresses, so that probably won't help.
You'll have to set up a local DNS then to handle resolving the addresses internally. I have no experience of this, but I'm pretty sure it's not that tricky - your server may already have the capability.