You can use Thunderbird as the email client of your choice. For doing that:
1. Go to the Thunderbird download page and download it based on the OS that you use.
2. After installation of Thunderbird, you will be presented with an Account Setup tab.
3. You can use whatever you want as the full name. Enter the email address of the account that you want to add and its password and then click Continue.
4. At this stage, Thunderbird will expand the window so that we can enter the details of incoming and outgoing email server.
5. You can fill the required details based on the initial email that you have received upon service activation which are:
a. Protocol as IMAP
b. Hostname (both incoming and outgoing section) as safari.administers.net
c. Port is 143
d. and Username (both incoming and outgoing section) is the email address of the account that you want to add.
6. Click Re-test and if everything have been done properly, you will see a green notification indicating that Thunderbird has successfully connected to the server.
7. Finally click Done.