Mails.ai vs Mixmax

Mails.ai provides email infrastructure and an API for AI agents to send, receive and parse transactional or conversational email. It is available on the web and through an API, with REST, webhooks, an MCP server, and TypeScript and Python SDKs. Inbound replies arrive as structured payloads containing sender, subject, body, headers and attachments, as well as an injection score and sender reputation. All plans scan inbound messages for prompt injection; optional classification can extract intent, entities and urgency for $0.003 per inbound. Listed integrations include Claude Code, Cursor, Cline, Continue, Windsurf, OpenAI Agents SDK, Anthropic SDK, LangGraph, Mastra, Vercel AI SDK and Pydantic AI. The maker describes the product as early, live and self-serve, and says the API refuses cold outreach. Free costs nothing for 3,000 events and one agent. Pro is $20 a month; Scale is $99 a month. Sends stop at a plan's monthly cap; excess inbound replies are stored but not scanned or sent to the webhook. The maker says it lacks SOC 2 today and does not include HIPAA in Phase 1 scope.

Mixmax is a sales engagement platform for revenue teams using Gmail or Outlook. It runs as a Chrome extension for Gmail, an Outlook add-in, and a web dashboard for sequences, reports, and workspace settings. Multi-stage sequences can send follow-up emails, create tasks, and schedule calls using merge variables and CSV uploads. Real-time email open and click tracking comes with desktop notifications, while scheduling links let recipients choose a time and add the meeting to both calendars. Rules can create Salesforce tasks after emails are opened or add recipients to sequences when deal stages change. Mixmax also syncs email, meeting, and sequence activity to Salesforce or HubSpot, and lists more than 40 native integrations included on every plan. The Free plan allows 20 tracked emails and up to 50 sequence recipients per month. Paid plans start at $29/user/mo billed annually; a 14-day trial is available. Mixmax requires Chrome for its extension and may limit one user's sending to 1,000 emails per day.