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Alternatives

SMTP2GO alternative: AgentiSend on price and guardrails

Is AgentiSend an SMTP2GO alternative?

Is AgentiSend an SMTP2GO 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 an SMTP relay, or for SMS on a paid plan.

Pick SMTP2GO when you want an SMTP relay, SMS on a paid plan, or a dedicated IP included at 100,000 emails; pick AgentiSend when you want a free plan that does not expire, the Starter price against their $15 step at 10,000 emails, and a send budget on every key. The figures below are from SMTP2GO pages fetched on 31 October 2026 and from this product's pricing table and published API.

What mattersAgentiSendSMTP2GO
A spending limit per keyEvery 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).The getting-started page says each API key can set a rate limit, which defaults to unlimited, and permissions for particular endpoints. The API keys article says a paid account has no limit on how many keys it can add. Neither page lists a count of emails the key may send.
What a refusal tells youEvery refused request carries code, message, fix (the call that repairs it), docs_url and retryable.The getting-started page says a missing, invalid or disabled API key returns 401 Unauthorized. The send guide says a failed request returns 400 with error_code and error. A field named fix that names the next call is not on either page.
A retry never sends twiceIdempotency-Key is accepted on every endpoint that changes something and remembered for 7 days.The send guide lists 13 parameters for /email/send, including sender, to, subject, html_body and text_body. An idempotency key is not among them.
How long the log keeps a message7 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.The free-plan article says free accounts see 5 days of Activity reporting and paying customers see 30 days, with an option to extend from 60 days to 2 years. The vendor page says email data is deleted once it reaches 35 days by default, and that paid plans can extend Activity storage to 60 days, 120 days, 1 year or 2 years.

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