Delete your current account:
Settings > Mail > Accounts > Select Account and choose “Delete Account” from the bottom of the page.
Next, go to Settings > Mail > Accounts > Add Account. Choose Microsoft Exchange.
Put in your email address and a description. The description can be anything you’d like it to be. This is only for how it will appear on your device.
When you click next, you’ll have the option to sign in or configure manually. IMPORTANT: Choose CONFIGURE MANUALLY, then put in the password provided when we set up the account.
In the server field enter “m/mullersys.com” and the domain field “mullersys.com” – You may have to enter your username again.
Select which services you would like to sync to this device from other devices using this address:
You’re all set. Click here to setup your account on Mac Mail.
If you’re receiving an error, it’s most effective to remove the account and start over rather than try and update settings. Feel free to call if you have any questions: 226-272-1504