You may have arrived at this post because you received an email with an attached PDF from a purported hacker who is demanding payment or else they will send compromising information—such as pictures sexual in nature—to all your friends and family. You’re searching for what to do in this frightening...
I can in Thunderbird but I don’t reply to companies. They have no reply email adress. Like here is your order number or there is our latest campaign. I use customer chat for help or company have internal message system like banks. In general I like to avoid using email due to the protocol design.