MailerSend alternative: AgentiSend on price and guardrails
Is AgentiSend a MailerSend alternative?
Is AgentiSend a MailerSend alternative? Yes, for transactional email sent through an API. A Free plan that does not expire: 5,000 emails a month, 170 a day, 3 domains, no card. Then plans from $9 a month (Starter, 30,000 emails). No daily cap on paid plans; delivery paced per inbox provider. Or 40% off paid yearly. It is not a replacement for SMS, or for a data center in the European Union.
Pick MailerSend when you want SMS on Starter and Professional, inbound routing on the free plan, or an EU data center with ISO 27001; pick AgentiSend when you want a free plan that does not expire, the Pro price at 50,000 emails against MailerSend Starter at $35, and a send budget on every key. The figures below are from MailerSend pages fetched on 31 October 2026 and from this product's pricing table and published API.
| What matters | AgentiSend | MailerSend |
|---|---|---|
| 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). | Tokens are created with scopes such as email_full, and a token can be paused. The token reference does not list a count of emails the token may send. The general errors page says MS42204 means the account reached the emails in its plan, or a sending limit it set for itself, and says to raise that limit under Plan and billing. |
| What a refusal tells you | Every refused request carries code, message, fix (the call that repairs it), docs_url and retryable. | The general errors table gives each failure a code and a message, such as MS42204. A field named fix that names the next call is not on that page. |
| A retry never sends twice | Idempotency-Key is accepted on every endpoint that changes something and remembered for 7 days. | The send reference lists the JSON fields for sending, including from, to, subject, text and html. An idempotency key is not among them. |
| 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 activity retention on the pricing table is 30 days on Professional, 7 days on Starter, and 1 day on Hobby and Free. API log retention is 7 days on Professional and blank on the other three columns. |
Read further
- AgentiSend vs MailerSend: all 13 rows, with a source for each.
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- Pricing: every plan and limit.
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