ResendServiceOur pick
An email API for sending app emails such as receipts, login links and newsletters.
Best for: Developer-friendly transactional email for new apps. Skip it if: You may need to send more than 100 emails on a single day for free.
Lovable connector (Lovable suggests its built-in Lovable Emails for basic app mail); official MCP server github.com/resend/resend-mcp.
Free
- 3,000 emails/month, max 100/day
- 3 verified domains
- Marketing email to up to 1,000 contacts
- 30-day data retention, 1 webhook endpoint
The 100-per-day cap bites first, and received (inbound) emails count toward the quota too.
Amazon’s low-cost email sending service for apps.
Best for: High-volume sending at the lowest per-email price, or as the sending backend for listmonk. Skip it if: You want templates, analytics and a friendly dashboard out of the box.
AWS publishes an 'amazon-ses’ agent skill; its SESv2 MCP server is a sample AWS says is not for production.
AWS Free Tier credits (new AWS accounts only)
- New accounts: up to $200 credits; the free plan lasts 6 months
- $0.10 per 1,000 emails after that
- Sandbox until approved: 200 emails per 24h, 1 per second, verified recipients only
No per-email free allowance is listed any more, and leaving the sandbox needs a manual AWS review (first reply within 96 hours).
An email marketing and transactional email platform, formerly called Sendinblue.
Best for: Small teams wanting newsletters and app emails in one cheap tool. Skip it if: You need bursts of more than 300 emails a day on the free plan.
Lovable connector; official hosted MCP server (mcp.brevo.com) plus a read-only docs MCP.
Free
- 300 emails/day (about 9,000/month)
- Transactional (API/SMTP) and marketing campaigns included
- Sending starts once Brevo approves the account
Free emails carry the Brevo logo (removed on Starter) and you can never send more than 300 in a day.
A free, self-hosted newsletter and mailing-list manager.
Best for: Cheap high-volume newsletters when paired with a low-cost sender like Amazon SES. Skip it if: You don’t want to operate a server.
No official MCP server found; has a built-in API.
Self-hosted (free)
- Software is free; limits depend on your server and sending provider
- Single binary plus PostgreSQL
- Needs an outside SMTP/sending service (supports multiple SMTP queues)
No official hosted version, so you run the server, database, backups and deliverability yourself.
An email platform for SaaS companies that handles product, marketing and transactional emails.
Best for: SaaS onboarding sequences, newsletters and app emails in one tool. Skip it if: You only need cheap high-volume transactional email.
Official hosted MCP (mcp.loops.so, OAuth) plus agent skills; not in Lovable’s catalog.
Free
- 1,000 subscribed contacts
- 4,000 sends per rolling 30 days, marketing and transactional combined
- 10 emails/second
Free emails include a 'Powered by Loops’ footer, and transactional emails use up the same 4,000-send pool.
Growth $49/mo: 5,000 contacts, unlimited sends
Checked 2026-10-27: loops.so, loops.so
A transactional email and SMS API for apps.
Best for: Low-cost transactional email with a cheap first paid step. Skip it if: You want to start without a card or an approval wait.
Official hosted MCP server (mcp.mailersend.com, beta) on all plans including Free.
Free
- 500 emails/month
- 100 API requests/day
- 1 domain, 1 template
- 1-day activity retention
The account must be approved, and a card and organization address are required even on the free plan.
An email API and SMTP service for sending and receiving app emails.
Best for: Apps that need an email API plus SMTP relay and inbound email routing. Skip it if: You need more than 100 emails a day or longer logs for free.
Lovable connector; official MCP server github.com/mailgun/mailgun-mcp-server.
Free
- 100 emails/day
- 1 custom sending domain
- 1-day log retention
- 1 user, 2 API keys, 1 inbound route
Logs disappear after one day, which makes delivery problems hard to debug.
An open-source email platform for transactional emails, newsletters and automations.
Best for: Open-source email you can start on cloud and move to your own server later. Skip it if: You need an established vendor with enterprise support.
Official MCP server @plunk/mcp (Aug 2026) with a read-only mode; also works with self-hosted instances.
Free (cloud) or self-hosted
- 1,000 emails/month on cloud
- Unlimited contacts
- Self-hosting via Docker Compose has no per-email fee from Plunk
Cloud free emails carry Plunk branding.
A transactional email service for app emails such as receipts and password resets.
Best for: Apps where reliable delivery of receipts and login emails matters most. Skip it if: You need a free tier you can launch on.
Official MCP server github.com/ActiveCampaign/postmark-mcp; a lookalike npm package 'postmark-mcp’ secretly BCC’d emails in Sept 2025, so install only from the official repo.
Developer
- 100 emails/month
- No overages allowed
- Does not expire
100 emails a month is only enough for testing.