Your Outlook inbox, in the Teams left rail.

Mail Rail is a Microsoft Teams app for fast email triage. Read, search, flag, archive and answer your Outlook email next to your chats and meetings — no more switching windows.

Open Mail Rail in your browser Add it to Teams

Works with Microsoft 365 accounts that have an Exchange Online mailbox. Your email is never stored by Mail Rail.

Built for triage, not for everything

Inbox and folders
Unread counts, sub-folders, and quick views for unread, flagged and files.
Search
Find mail by sender, subject or body across your mailbox.
Safe reading
HTML email in a sandbox, remote images blocked until you allow them, one-click attachment downloads.
Answer fast
Reply, reply all, forward and new email with attachments, plus keyboard shortcuts.
Teams context
Start a Teams chat or meeting with everyone on an email, or share a Teams link to it.
Activity feed alerts
Optional Teams notifications for new or flagged mail that open the message in Mail Rail.

For IT administrators

Mail Rail uses Microsoft Entra single sign-on and delegated Microsoft Graph permissions only (User.Read, Mail.ReadWrite, Mail.Send). Pin it for everyone with a Teams app setup policy. See support for the admin guide.