On Linux, use apt-get or yum to install Thunderbird.
apt-get install thunderbird yum install thunderbird
Create your mail account
Note: Instead of selecting Done, select Manual Config to verify or adjust the servers Thunderbird will be using.
There might be a warning that the domain does not use encryption. If you trust the incoming and outgoing servers, select I understand the risks and then select Done.
Selecting Get Messages at the upper left-hand corner of Mozilla Thunderbird should retrieve emails from the email server. Emails can be created by selecting Write.