Have to change mail server address when I go into office?!?!?

Hi there,
This may be a more broad networking-type issue, but I thought I'd post here as it's mail in which I am affected.
When I am on the road, I have an IP address in my "mail server" settings (IMAP). However, when I am inside the office network, this IP fails and I need to manually change it to the internal IP address.
Does anyone know a way around this issue, so that I (and all the other mobile people) could simply have the external IP address of the company permanently in account settings.
I'm thinking some way of forwarding requests to the external IP to the internal one.
Someone please help, it's a small but remarkably annoying situation!!
Thanks, Ben

This is not hard to fix, but requires access to your companies internet DNS server.
Most companies managed seperate dns zones one for interal and external.
The trick is to set up a External Zone on your internet DNS server. For example.
Your external mail server name is
mail.company.com(65.21.21.11)
and your internel name is
mailserver.company.lan (192.168.1.10)
Add a new zone to your Internal DNS server for company.com
Add all the A records from the external zone to the new internal zone, but use the internal IP addresses instead of the external.
Then on your mail client you just setup mail to point to mail.company.com and DNS will do the rest for you.
This makes life simple on the users, but is more work to update DNS because you have to manually change the records in both zones every time you update a DNS record.

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