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Start a 1:1 chat

Start a private, one-to-one conversation with someone by their PostNumber.

Security note: A direct chat is end-to-end encrypted, so only you and the other person can read it. To be sure you're really talking to the right person, verify them.

A 1:1 is a private conversation between just the two of you. You start one by entering the other person's PostNumber — such as CH 6578 9 or DE 0777 HSBC 0001 — or by finding them in your directory.

On Web & Desktop

  1. In the left panel, select the + (New chat) button, then choose Start chat.
  2. In the search box, type the person's PostNumber or their name.
  3. Pick the right person from the results.
  4. Select Go (or Start chat) to open the conversation.
  5. Type your first message in the box at the bottom and press Enter to send.

On iOS

  1. Tap the compose button (the pencil or + icon).
  2. Tap Start chat.
  3. Type the person's PostNumber or name in the search box.
  4. Tap their name in the results.
  5. Type your first message and tap Send.

On Android

  1. Tap the compose button (the floating + or pencil icon).
  2. Tap Start chat.
  3. Type the person's PostNumber or name in the search box.
  4. Tap their name in the results.
  5. Type your first message and tap Send.

Good to know

  • A 1:1 chat stays between the two of you. To talk with more people, create a silo instead — see Silos.
  • If you can't find someone, check the spelling of their PostNumber. People outside your company won't appear in your directory; you'll need their full PostNumber.
  • The first time you message someone, Letro sets up encryption for the conversation automatically. You don't have to turn anything on.
  • Not sure it's really them? Verifying the person confirms their identity so no one can impersonate them.

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