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AgentiSend vs Mailtrap
Yes, AgentiSend is a Mailtrap alternative for transactional email an agent sends through an API, while Mailtrap is the product whose sandbox never delivers a message. POST /emails/preflight runs every send gate and does not send the message. A Free plan that does not expire: 3,000 emails a month, 100 a day, 3 domains, no card. Then plans from $9 a month (Starter, 30,000 emails). No plan daily cap; delivery paced per inbox provider. Or 40% off paid yearly.
Pick Mailtrap when you want a sandbox whose messages never reach a real inbox, inbound mail on the free plan, or a SOC 2 Type II report on every plan; pick AgentiSend when an agent holds the key and you want a per-key budget and a kill switch. The figures below are from Mailtrap pages fetched on 21 October 2026 and from this product's pricing table and published API.
| What matters | AgentiSend | Mailtrap |
|---|---|---|
| Trying it before paying | A Free plan that does not expire: 3,000 emails a month, 100 a day, 3 domains, no card. Then plans from $9 a month (Starter, 30,000 emails). No plan daily cap; delivery paced per inbox provider. Or 40% off paid yearly. | Email API/SMTP free is $0 and is described as free forever: 4,000 emails a month, 150 a day, no card. Email Sandbox is a separate free tier of 50 test emails a month. Email API/SMTP paid plans start at $15 a month for 10,000 emails. |
| A spending limit per key | Every key is created with a send budget. The send path refuses with agent_budget_exceeded when it is spent, and a key cannot raise its own. The plan inclusion is a second ceiling (plan_limit_reached). | A per-key send budget is not on the pricing plans page. The rate-limits page sets 150 requests per 10 seconds per API token, shared by every endpoint, which is a request cap rather than a send budget. |
| A retry never sends twice | Idempotency-Key is accepted on every endpoint that changes something and remembered for 7 days. | The send transactional page does not document an idempotency key. A repeated call is not described as returning the first result. |
| What a refusal tells you | Every refused request carries code, message, fix (the call that repairs it), docs_url and retryable. | A failed send returns success set to false and an errors array of strings. The bad-request response says to fix the errors listed before retrying. A field named fix that names the next call is not on that page. |
| How long the log keeps a message | 7 days on Free, 30 on Starter, 90 on Pro, 180 on Scale. It is part of the plan and there is no add-on to buy. | Email log retention is 3 days on Free, 5 days on Basic, 15 days on Business, and 30 days on Enterprise. |
| What the model can call | A hosted MCP server with 92 MCP tools (46 listed by default, the rest named by list_more_tools). An agent gets the same budget and kill switch over MCP as over the API. | The MCP server is a Node.js command-line utility, not a hosted URL. The page names three groups: sending transactional email, sandbox testing (send, retrieve and view), and template create, list, update and delete. It does not give a tool count. |
| Audited security reports | None yet. No SOC 2 report and no penetration-test letter exist, and /security says so. | Every plan, including Free, lists GDPR, ISO 27001 and SOC 2 Type II. |
| Where the data sits, and a dedicated address | Not offered. Customer data is processed in the United States. Dedicated IP on request. Once one is assigned, the published ramp is 20% of volume to day 7, 40% to day 14, 60% to day 21, 80% to day 28, then all of it, on GET /dedicated-ips/ramp. | A choice of processing region is not stated on the pricing plans page. Business adds a dedicated IP with automatic warmup. The dedicated IP page says shared addresses are the default, a dedicated address is reviewed one request at a time, and a new one follows a 21-day schedule that starts at 300 emails on day 1. |
| Receiving mail | Receiving is a switch on each verified domain: publish one MX record and mail to that domain is stored on your account, with extracted_text beside the raw body, a clear or review label on every message, an optional hold until a person releases it, and allow and block rules per domain. There is no inbox object; the domain is the address. | Every plan, including Free, includes inbound email: a dedicated receiving address, parsed messages through the API, and webhooks. Sent and received messages share one monthly quota. A domain can hold a catch-all inbox after its MX record is added. The receiving page says rules that match one username are not available yet. |
| A sandbox that does not deliver | POST /emails/preflight runs every send gate and does not send the message. | Email Sandbox is a separate product whose messages do not reach a real inbox. Free is 50 test emails a month, 1 sandbox, and 10 emails kept in that sandbox. Paid sandbox plans start at $17 a month, or $14 a month billed annually, for 500 test emails. |
Sources
- Trying it before paying. Ours: the published API, /pricing and /security. Theirs: https://docs.mailtrap.io/account-and-organization/billing/plans (captured 2026-10-21).
- A spending limit per key. Ours: the published API, /pricing and /security. Theirs: https://docs.mailtrap.io/account-and-organization/billing/plans and https://docs.mailtrap.io/developers/rate-limits (captured 2026-10-21).
- A retry never sends twice. Ours: the published API, /pricing and /security. Theirs: https://docs.mailtrap.io/developers/email-sending/transactional/send-transactional-email (captured 2026-10-21).
- What a refusal tells you. Ours: the published API, /pricing and /security. Theirs: https://docs.mailtrap.io/developers/email-sending/transactional/send-transactional-email (captured 2026-10-21).
- How long the log keeps a message. Ours: the published API, /pricing and /security. Theirs: https://docs.mailtrap.io/account-and-organization/billing/plans (captured 2026-10-21).
- What the model can call. Ours: the published API, /pricing and /security. Theirs: https://docs.mailtrap.io/for-ai-agents/tools/mcp-server (captured 2026-10-21).
- Audited security reports. Ours: the published API, /pricing and /security. Theirs: https://docs.mailtrap.io/account-and-organization/billing/plans (captured 2026-10-21).
- Where the data sits, and a dedicated address. Ours: the published API, /pricing and /security. Theirs: https://docs.mailtrap.io/email-api-smtp/deliverability/ip-warmup and https://docs.mailtrap.io/account-and-organization/billing/plans (captured 2026-10-21).
- Receiving mail. Ours: the published API, /pricing and /security. Theirs: https://docs.mailtrap.io/inbound-email/receiving-emails and https://docs.mailtrap.io/account-and-organization/billing/plans (captured 2026-10-21).
- A sandbox that does not deliver. Ours: the published API, /pricing and /security. Theirs: https://docs.mailtrap.io/account-and-organization/billing/plans (captured 2026-10-21).