Some possible causes include internet connectivity issues, emails being accidentally deleted or sent to the trash folder, problems with external email clients, or technical issues with the device or browser you are using to access your email.

Check the remaining storage in your Google Drive account. Gmail messages and attachments use up storage space in Google Drive. So Gmail not working on Android could actually be an issue with your whole Google account storage, preventing you from sending or receiving new mail. Update the Gmail app.

Gmail is made for private use by individuals while Google Workspace is made for business (solo professionals to enterprises). Google Workspace as opposed to Gmail, is built for team collaboration and provides added customization, integration, security measures, and storage space that are essential for business users.

When you sign up for Google Workspace, you'll gain access to a set of integrated apps that work together seamlessly. For instance, you can receive a message in Gmail and instantly convert it into a Calendar event. When you make a comment in Docs, Sheets, or Slides, collaborators automatically receive email alerts.