Thunderbird is a popular open-source email client from the Mozilla team. You can download Thunderbird for free here:
After installing, start Thunderbird and click the Mail Icon in the left hand menu. Next click the “Account Setup” icon on the far right.
The “Set Up Your Existing Email Address” dialog will be displayed.
Enter your name, email address, and password and click the “Configure Manually” button to move to the next screen.

Enter “mail.reliablepenguin.com” in the “Incoming Server Hostname” field and the “Outgoing Server Hostname” field.
Enter your full email address in both of the “Username” fields at the bottom
Set Connection Security to "SSL/TLS method" in the “Incoming Server Hostname” field and the “Outgoing Server Hostname” field
Set Authentication method to "Autodetect" in the “Incoming Server Hostname” field and the “Outgoing Server Hostname” field
Set port to 993 in the “Incoming Server Port” field
Set port to 465 in the “Outgoing Server Port” field
Click the “Re-test” button. If the test fails then double check the server names and your email address. Also make sure you are typing your password correctly. Make sure you don’t accidentally add extra spaces before or after any of the fields.
Once the test completes successfully then click the “Done” button to finish the setup.
Setup is now complete and you’re ready to send and receive email. Contact support if you need assistance with this setup.