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Transactional email APIs

5 transactional email APIs ranked on 6 criteria, including pricing clarity, free tier and compliance documents. How we score

APIs that send password resets, receipts and alerts, compared on what their plans and security pages commit to. 5 products, checked Oct 2026.

5 products

  • Resend

    Transactional email APIs

    What you're paying for: Compliance included

    A SOC 2 Type II report and a pre-signed GDPR DPA on every plan, with 3,000 free emails a month and 50,000 for $20.

    • Free plan
    • Self-serve
    • Tiered
    From$20/moFacts checked

  • Amazon SES

    Transactional email APIs

    What you're paying for: Worth the price

    Email at $0.10 per 1,000 with no monthly fee, inside AWS’s SOC, ISO 27001 and HIPAA-eligible scope, in the region you choose.

    • Free trial
    • Approval wait
    • Usage-based
    From$0.10/1k emailsFacts checked

  • Mailgun

    Transactional email APIs

    What you're paying for: Compliance included

    SOC 2 Type II and ISO 27001 for Mailgun itself, US or EU sending from one account, and SAML SSO included at $90.

    • Free plan
    • Self-serve
    • Tiered
    From$15/moFacts checked

  • SendGrid

    Transactional email APIs

    What you're paying for: Compliance included

    SAML SSO, a dedicated IP and EU data residency together on one self-serve plan at $89.95, with SOC 2 Type 2 across every plan.

    • 60-day free trial
    • No card needed
    • Self-serve
    • Tiered
    From$19.95/moFacts checked

  • Postmark

    Transactional email APIs

    What you're paying for: Saves engineering time

    Inbound email processing and up to 365 days of message history from $16.50 a month, so you do not build mail parsing or log storage yourself.

    • Free plan
    • No card needed
    • Self-serve
    • Usage-based
    From$15/moFacts checked

Showing 5 of 5 products

Comparisons in this category

In depth

Head to head

How we test transactional email APIs

Transactional email APIs send the messages your product triggers: password resets, receipts, sign-in links and alerts. They all send email; the differences are in what each plan includes and what the vendor commits to on paper.

We compare them on the same six indicators, read from each vendor's pricing, security and documentation pages:

  • Pricing clarity: whether every self-serve tier and the overage rate are published.
  • Free tier: how many emails a month you can send for free, and with how many users.
  • Price at 50,000 emails: the lowest listed monthly cost.
  • Compliance documents: the vendor's own SOC 2 Type II report, ISO 27001, a DPA, EU options, a HIPAA BAA.
  • Team access controls: SSO, unlimited users, two-factor authentication.
  • Message history: how long the cheapest paid plan keeps your logs.

Each review says which pages it was written from and when. Where we have run a product hands-on, the evidence is on its page.

Read the full methodology