Uol.com.br supports IMAP / SMTP

This means you don't have to use Uol.com.br's webmail interface! You can check your email and send messages using other email programs (like Mailspring, Outlook Express, Apple Mail, or Mozilla Thunderbird). Using desktop email applications can improve your workflow. They typically offer more options, and your email is still available on your computer when you're disconnected from the internet.

Setup Your Uol.com.br Account with Your Email Program Using IMAP

To access your Uol.com.br email account from a desktop email program, you'll need the IMAP and SMTP settings below: