Can't access work IMAP from home

Hi
We're running mail service (IMAP) on OS X Server 10.3.9 at the office. Everything works fine when I'm on the network locally - I can send and receive external emails etc.
However, I can't access the server from home using either the domain name or IP address. I used to be able to but we've recently changed ISP & router and I'm not sure if this has affected it. I assume the MX records for the domain are fine since we can send and receive.
I'm not really an IT admin-type guy (it's just kinda become my responsibility) so I don't fully understand DNS, local domains etc.
If anybody has any pointers, I'd really appreciate it.
Thanks
Ian
Mac OS X (10.3.9)
PowerBook G4 1.5 Mac OS X (10.4.8)
Mac OS X (10.4.8)

Everything works fine when I'm on the network locally - I can send and receive external emails etc.
However, I can't access the server from home using either the domain name or IP address. I used to be able to but we've recently changed ISP & router and I'm not sure if this has affected it.
DNS Basics: the DNS server basically resolves a 'name' to an IP address. E.g. mail.mydomain.com to the IP address of the mailserver.
When you are inside the local network (LAN), your computers probably find the server using a local IP address. When you are outside the LAN, then your computer will find it EITHER by using the public IP address of your firewall OR using a name which will resolve to the same.
Since it worked before you changed ISPs, I'm guessing that you had it set explicitly to the WAN IP address. This will have changed with the change of ISP.
Easiest way to fix this is to use the same host name as you MX record is set to. So if your MX record is mail.mydomain.com then use this as it is obviously resolving to the IP address of your mail server (or more exactly, the IP address of your firewall).
NEXT, since your router has also changed (and I presume this is also your firewall) then you need to ensure that the imap port required (143) is open and port-forwarding to the internal IP address of the mail server.
-david
Server 10.4.8

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