If you're building in India, picking a transactional email API comes down to four questions: what it costs in rupees, where your email is sent from, what happens when a customer hits reply, and whether your AI coding agent can set it up for you. This guide compares six providers on all four. I run MailKaka, one of the six, so the numbers below come straight from each provider's pricing page, including where MailKaka is not the cheapest.
What 10,000 to 1,00,000 emails a month cost
Monthly list prices for sending through the API, before GST. Dollar prices are converted at ₹94 to $1; paying in dollars by card also adds your bank's forex markup, which isn't included here.
| Provider | 10,000 | 50,000 | 1,00,000 |
|---|---|---|---|
| MailKaka | ₹899Starter (25,000) | ₹1,499Send (50,000) | ₹3,999Growth (1,00,000) |
| Resend | ~₹1,880 | ~₹1,880 | ~₹3,290 |
| MailerSend | ~₹1,363 | ~₹3,290 | ~₹6,392 |
| Postmark | ~₹1,410 | Not published | Not published |
| MSG91 | ₹2,000 | ₹2,000 | ₹2,000 |
Checked on 9 November 2026. SendGrid is left out because its pricing page didn't list per-volume prices when we checked; its entry plan starts at $19.95 a month. Postmark prices volumes above 10,000 on a slider on its site. MailKaka figures are the cheapest plan that includes that volume.
MSG91 is the cheapest option above 50,000 emails a month. Below that, MailKaka costs the least of the providers here. Resend costs more than MailKaka at 10,000 and 50,000 emails, and less at 1,00,000.
Where your email is sent from
Sending from India keeps the hop to Indian inboxes short and helps if your privacy policy promises Indian data handling under the DPDP Act. MailKaka and MSG91 send from India. Resend, SendGrid, Postmark and MailerSend have no India sending region. More on this in why sending from India matters and the DPDP Act checklist.
Side by side
| Provider | Sends from | Billed in | Customer replies | AI agent access |
|---|---|---|---|---|
| MailKaka | Mumbai, India | INR | Shared team mailbox on every domain | Hosted MCP server, browser sign-in, per-agent limits |
| Resend | US, Ireland, São Paulo or Tokyo | USD | Inbound via webhook and API | Hosted MCP server, CLI and agent skills |
| SendGrid | US | USD | Inbound Parse webhook | No official MCP server |
| Postmark | US / EU | USD | Inbound webhook (Pro and up) | MCP server you run yourself |
| MSG91 | India | INR | Unified Inbox on its wider platform | Local CLI exposes APIs as MCP tools |
| MailerSend | EU | USD | No built-in reply mailbox | Hosted MCP server |
When a customer hits reply
Most of these providers can receive email, but they hand each message to your code through a webhook. If you want replies to reach a person, you build that inbox yourself or send from a no-reply address, which customers dislike. MailKaka gives every domain a shared team mailbox, so a reply to an order confirmation lands where your team can read and answer it. Why that matters.
Letting an AI agent set it up
If you build with Claude Code, Cursor or another coding agent, the fastest setup is one where the agent does the work: adds your domain, shows the DNS records, checks verification, sends a test and writes the integration. That needs an MCP server, and the details matter. An agent that can send email can also send it to the wrong people in a loop, so look for limits per agent, not just per account.
MailKaka's hosted MCP server limits each agent to 60 sends a minute and 500 emails a day, warns the workspace owner by name when one agent's bounce rate passes 5%, and lets you remove any connection from the dashboard. The step-by-step is in how to send email from Claude Code, and how to limit what an agent can send covers the risks.
BUILT FOR AI AGENTS
Let Claude Code, Cursor or any MCP client run your email.
MailKaka hosts an MCP server. Connect your coding agent once, and it can add your domain and show the DNS records, check verification, send a test email, read delivery status, and create the API key your app needs. You sign in from a browser and choose what it's allowed to do.
- Per-agent limits: 60 sends a minute and 500 emails a day
- Separate permissions for viewing, changing, sending and mailboxes
- A preview before deletes, batch sends and new API keys
- Every connection listed, and removable, in the dashboard
claude mcp add --transport http mailkaka https://www.mailkaka.in/api/mcpWhich one to pick
- High volume, email plus SMS or WhatsApp, billed in rupees: MSG91.
- Small team or solo founder sending from India, who wants replies handled and an agent to do the setup: MailKaka. It has a free plan with 3,000 emails a month and no fixed daily cap.
- Already on Resend and happy with US or Tokyo sending: stay, or move in about 10 minutes if you want rupee billing and an inbox.