Our problem is that we cannot access our webmail through Outlook because we cannot access the mail.ourcompany.com address from our offices on our network. We get the feeling that we have to change our DNS on our network from a .com to a .loc. Do you think this is the case?
mail.ourcompany.com A 192.168.1.1
192.168.1.1 is the IP address of your ISP's mail server, but you should find someone who understands DNS well and have them set this up.
If you want to get a bit more sophisticated, you could implement a round-robin DNS for mail.ourcompany.com for redundancy under the condition your ISP has more than one server that you can connect to.
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