Jean Carlos Vargas
Jean Carlos Vargas is a senior full-stack product engineer and technical founder who builds SaaS, AI workflows and production systems. His current flagship project, MepMail, is an open-source email platform combining transactional email, SMTP, business mailboxes and AI-agent access.
At a Glance
- SaaS and software-product teams
- Developers integrating transactional email
- Teams and small businesses needing email on their own domain
- Marketing and newsletter operators
- +2 more
AI Tools by Jean Carlos Vargas
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MepMail
Open Source Email API Platform
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Latest News
MepMail repository added billing eligibility and safety-review protections for paid upgrades, alongside tests for contracted mailbox amounts.
The MepMail MCP README added an MCP Rush grade-A/trust-score-100 listing, and the repository documented npm package/version synchronization for @mepmail/mcp and @mepmail/cli.
@mepmail/mcp 0.3.2 was published on npm as the official local MCP server for MepMail.
MepMail desktop 1.0.3 for Linux released, keeping Microsoft/Google connected-account sign-in inside the app and preparing the shared codebase for Android and iOS.
Products & Services
Resend-compatible transactional email API, SMTP relay and broadcast/newsletter platform running through Amazon SES, with domains, templates, contacts, webhooks, suppression handling, deliverability checks and logs.
Business email on a domain the customer owns, with webmail mailboxes for people and AI agents, permissions, approval-based sending, import over IMAP, scheduling, undo send, rules and desktop applications.
Official hosted OAuth MCP server at api.mepmail.dev/mcp plus the local @mepmail/mcp npm package for Claude, Cursor, Codex and other MCP clients. It supports sending, email management, contacts and controlled mailbox operations.
Command-line migration tool that moves contacts, segments, topics, properties, templates, webhooks, suppressions, domains and broadcasts from Resend to MepMail, with plan/apply/status/rollback workflows.
Market Position
MepMail positions itself as an open-source, self-hostable alternative to Resend, SendGrid, Mailgun and Postmark for sending, and to Google Workspace or Microsoft 365 for domain email. Its differentiator is combining a Resend-compatible API/SMTP/broadcast layer with human and AI-agent mailboxes, scoped MCP permissions and approval-based sending.
Leadership
Founders
Jean Carlos Vargas
Senior Full-Stack Product Engineer and Technical Founder (GitHub profile); describes his work as founder-led product engineering from business problem through shipped, verified software. He identifies as JE4NVRG/JE4NDEV and says he leads MepMail's product direction, API and infrastructure engineering, SDK compatibility, releases and acceptance QA.
Executive Team
Jean Carlos Vargas
Technical Founder; Senior Full-Stack Product Engineer
Based in Paraná, Brazil. His public GitHub profile says he builds SaaS, AI workflows and reliable production systems; for MepMail he lists product direction, API and infrastructure engineering, SDK compatibility, release and acceptance QA.
Founding Story
MepMail is a founder-led product built by Jean Carlos Vargas and presented as a fork/evolution of the MillionSend open-source project. The initial vision was to provide an open-source, self-hostable alternative to Resend, SendGrid, Mailgun and Postmark for application email, while also combining domain-based business mail and controlled AI-agent access in one platform.
Business Model
Revenue Model
Hosted MepMail Cloud subscriptions: Correio is priced per mailbox plan and Send is priced by email volume. The open-source AGPL software can also be self-hosted, in which case the operator pays for infrastructure such as AWS SES rather than a MepMail Cloud subscription.
Pricing Tiers
1 mailbox, 500 outbound recipients/month and up to 3 domains; 7-day trial with a card.
3 mailboxes, 2,000 outbound recipients/month and up to 3 domains; 7-day trial with a card.
10 mailboxes, 10,000 outbound recipients/month and up to 10 domains; 7-day trial with a card.
100 emails/day, one domain and one workspace; no card required.
1,500 emails/day, 10 domains and 3 workspaces.
110,000 emails/month, 25 domains and 10 workspaces; eligible new customers get US$20 on the first monthly bill.
550,000 emails/month with US$0.29 per 1,000 overage.
Target Markets
- SaaS and software-product teams
- Developers integrating transactional email
- Teams and small businesses needing email on their own domain
- Marketing and newsletter operators
- AI-agent and automation builders
- Organizations seeking open-source or self-hosted email infrastructure
- Transactional email for SaaS and digital products, including sign-up, password, receipt and notification messages
- Marketing broadcasts and newsletters with contacts, topics, templates and unsubscribe handling
- Replacing or migrating from Resend while retaining existing SDK-based sending flows
- Business email for teams on a domain they own
- AI agents that read mail, draft replies and send directly or request human approval
- Organizations that want to self-host email infrastructure on Amazon SES