Thunderbird is a free, open-source, cross-platform application for managing email. You can use that tool to adminstrate your e-mail account which you set up via your Servage control panel.
With the following links and steps you can install and use Thunderbird with your Servage e-mail accounts
1) download the client (the software will be installed on your locale computer):
https://www.thunderbird.net/en-US/
2) in the second step you need to configure the application. The process only requires few steps. On the following page, you find a step by step guide
https://support.mozilla.org/en-US/kb/manual-account-configuration
During the setup process, ThunderBird will ask you for the server settings for incoming and outgoing e-mails. Here is an overview of the Servage server:
Incoming Server Address (IMAP): imap01.servage.net
Port: 143
Incoming Server Address (POP3): pop01.servage.net
Port: 110
Outgoing Server Address (SMTP): smtp01.servage.net
Port: 587
NOTE: Even if you want to use TLS connection for emails, the details remain the same as above.
Make sure authentication is enabled for your outgoing server in your email client.