Connect your AI agent to Lettr
Lettr is an email and messaging platform for transactional delivery, templates, audiences, campaigns, domains, and webhooks.
Set it up in Melso
- 1In Melso, open Settings → Agent Apps and hit Connect on Lettr.
- 2Finish the API_KEY sign-in in the window that opens. Melso stores the connection, not your credentials.
- 3Open your agent, go to its Agent Apps tab, and allow Lettr.
- 4Give the agent a task. It calls Lettr itself when the work needs it.
What Lettr gives your agent
The tools, permissions, and events Lettr exposes — the same ones your agent can use once the app is authorized.
What you sign in with
Lettr connects with API_KEY.
Permissions
Lettr does not break access down into granular permissions.
Tools Lettr exposes
Attach Contacts to Lists
Attach every combination of 1-1000 contacts and 1-50 audience lists, processing up to 50,000 contact-list pairs and reporting new and existing memberships.
Bulk Create Audience Contacts
Create or recognize up to 1000 normalized, deduplicated contacts. Shared properties affect only newly created contacts; list_id applies to all contacts, including those that already exist.
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