MailBoxMailBox 
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The latest version of MailBox is 1.0 on Mac Informer. It is a perfect match for E-mail in the Communication category.
MailBox puts your Gmail inbox right in your Menu Bar, giving you a quick, lightweight way to send or read emails without opening a browser. Enjoy fast email access ideal for productivity, remote work, and multitasking on Mac.
Switch easily between three display modes: Mobile for a compact view, Desktop for a full and clear inbox layout, or Older mode for a classic Gmail look. MailBox supports searching messages, replying, forwarding, and managing your Gmail account while using minimal CPU resources.
Though the window isn’t resizable and Settings may freeze in Mobile mode, this free tool remains a convenient solution for managing Gmail faster than a browser.
• Quick access to Gmail from the Mac Menu Bar • Send, read, reply, and forward emails with ease • Three display modes: Mobile, Desktop, and Older “vintage” Gmail view • Lightweight performance — minimal CPU usage for faster workflow • Simple Gmail management with search and message tools