Thunderbird is an Email Client Software, and you can work with it in the following way.
1. Open Mozilla Thunderbird.
2. In the left panel, you can see a list of your email accounts. Double Click on
Inbox or if it is hidden, click on your email, and it will expand and show the inbox, the trash list. Etc.
![check-email-in-thunderbird.gif](/img/check-email-in-thunderbird.gif)
Another option is to right-click on the email and click on
"Get Messages".
Thunderbird also automatically checks email every 5 to 10 minutes. It also automatically checks mail when you open the program.