- © 2026 Mailsoftly Inc. The name "Mailsoftly" and the Mailsoftly logo are registered trademarks of Mailsoftly Inc.
Create and update contacts, manage lists, tags and segments, draft and send campaigns, read results, build automations. Every endpoint carries the permission it needs, so a key or an OAuth token can be as narrow as you like. API and webhooks page.
Any app can start a Mailsoftly automation by posting JSON to a webhook endpoint you create, and any automation can post a contact's data to your system with a webhook step. No connector required.
The hosted MCP server exposes the product as curated tools with OAuth sign-in and a separate sending permission. Claude connects in one click from the directory; other clients add the server URL. MCP server page, Claude page.
Google Workspace, Microsoft 365, HubSpot, WordPress, Shopify and Jotform connect from the Integrations screen, and Zapier bridges thousands more. See the integrations overview.
At app.mailsoftly.com/developers, next to your account. It is generated from the live API, includes an OpenAPI specification you can import into any client, and covers authentication, every endpoint and the permissions each one needs.
With an API key from your account settings for your own integrations, or with OAuth for apps and assistants that act on behalf of your users. Both carry scopes, so a credential can read contacts without being able to send anything.
Yes, through the hosted MCP server, which publishes the API as curated tools. Claude connects from the Claude directory in one click; any MCP client can add the server by URL. Sending is a separate permission the user grants on purpose.
Yes, the same published limits as on the pricing page: contacts and emails per month for the plan, with any exception agreed for the account. Free accounts that have not verified a sending channel keep a small number of automations, forms and landing pages, and the API says so with the upgrade or verify path.
Every free account is one: you can create contacts, lists, drafts and automations and read everything back. Sending needs a sending channel the account owns, which is the same rule the product applies.
Connect Google Workspace, Microsoft 365, HubSpot, WordPress, Shopify or Jotform from the Integrations screen, bridge anything else through Zapier, or let an assistant do the work through the MCP server.
Sign up free, create an API key in your settings, and make your first call in minutes.
Open the API reference Start free with Google Start free with Microsoft 365