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Every message that arrives in your Langmail mailbox is processed on arrival — whether it came in natively over SMTP or was synced from a connected Gmail account. The results are stored as standard mailbox keywords, so humans see them in webmail and agents can filter by them over MCP.

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The categories

Each message is classified into one of five categories; the orthogonal todo flag comes on top (next section). All six values are accepted by the search_emails keywords filter:
ValueWhat lands here
directPersonal emails from individuals and direct conversations
receiptOrder confirmations, shipping updates, delivery notifications, purchase receipts
newsletterRegular updates, news digests, curated content
notificationSecurity alerts, terms updates, service notifications
promotionalMarketing emails, sales pitches, discount offers
todoMessages flagged as requiring action — see below
Categories are stored on the message as mailbox keywords ($label:receipt and so on). In tool results they appear on the tags: line; in webmail they show as labels and are searchable.

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To-do detection

Orthogonally to its category, each message is checked for whether it needs explicit action from you — a deadline, a payment, a form, a confirmation. Those messages get the todo keyword on top of their category, which makes “what needs my attention?” a one-call query for an agent:
Tool call — search_emails
{ "keywords": ["todo"] }

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Summaries and the Morning Brief

Each processed message also gets a short generated summary. Once a day, the Morning Brief email delivers your open to-dos and the categories you opted into — in the language you choose — so the default way to consume a busy inbox is one email, not fifty. You configure the brief (categories, language) in the Langmail app. If you choose the clean-inbox style, handled messages are auto-archived after classification, keeping the inbox itself down to what matters.

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Connected Gmail accounts

You can connect one or more Gmail accounts to the same Langmail user. Their mail is synced in — live updates plus historical backfill — and processed by the same pipeline. State flows back too: a to-do appears in Gmail as a Todo label, and archiving in Langmail archives in Gmail, whether the change came from an agent, MCP, or webmail. Mirroring is on by default and can be disabled per account.
Agents see one unified mailbox: synced Gmail messages and native @langmail.me mail are searched by the same tools with the same filters.