We are going to be using MX Toolbox to troubleshoot your email issue.
Step 1. Check your nameservers are setup correctly
First thing is to check to ensure that the domain name for your domain is pointing to the correct nameservers.
In MX Toolbox DNS option put in your domain name and lookup your DNS servers. Make sure they are correct, if you are hosting with CyberHub they are
If the nameservers are not correct login to domain name control panel and update the nameservers to the correct ones. If you are hosting your domain name with CyberHub you can login to https://cyberhub.co.nz/accounts/clientarea.php
Step 2. Check the MX Record for your domain name
The MX Record is the DNS setting which determines where your emails are sent to, this needs to be correct. You can check your MX record by going to MX Toolbox MX Record lookup tool.
Your MX Record should be pointing to your email server, this can be a variety of things. Below are some common email services that you may be using.
CyberHub Cloud Email
With Office 365 they give you a MX record with your own, if you are unsure about what your Office 365 mx record is meant to be. You need to get in touch with your Office 365 Administrator and ask them what it should be. They will be able to find out by logging into their Office 365 administrators account and looking it up.
Step 3. Check Webmail
The next step is to login to your webmail account, you will be checking two things.
1. Is the username and password that you are using correct?
2. Can you send and receive email from the webmail account.
If your webmail is working correctly you will now know that the issue is probably with a setting in your email client (Outlook, Outlook Express etc)
If you can't login to your webmail it will be because your password is wrong, your IP address is blocked or something like that. So you need to get in touch with your administrator to sort out.
Once you get that issue resolved your email should then work on your chosen email client.