ELI5: Explain Like I'm 5

MH & xmh: Email for Users & Programmers

Mh & Xmh are programs that help you send and receive emails. They help you keep track of emails that you send and receive, so you don't forget any important messages. They are mostly used by people who want to be able to create more advanced emails, like those with images and large attachments. They are also used by programmers who want to create their own programs that help people use emails.