Mails red

I think you might be thinking of a specific type of mail or package that is red in color. Could you please provide more context or clarify what you mean by "mails red"? Are you referring to:

• A specific type of mail, such as a red envelope or package?
• A particular postal service or company that uses red as a color for their mail?
• A metaphorical or figurative sense of "mail" being red, such as a warning or alert?

I'd be happy to try and help you further if you could provide more information!