Use the new-conversation modal for a single message to one person: a reply to something that came in elsewhere, an introduction, or a template you want to see land in a real inbox.
1

Click + in the inbox header

The modal opens.
2

Pick a recipient

Type a name, email or LinkedIn URL and the box autocompletes from your CRM. If the person is not there yet, choose Create new customer to add them without leaving the modal.
3

Pick a channel and an account

Email, LinkedIn or Telegram, then the credential to send from. The credential list is filtered to that channel and to credentials reading active.
4

Write the message

Subject and body for email; body alone for the other two.
5

Send

The conversation appears in the inbox, and later replies from that customer land in the same thread.

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When to use a campaign instead

Sending to more than a handful of people, or wanting an automatic follow-up, belongs in a campaign: it scopes the audience, retries failures, waits between steps and reports what happened.