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TransactionalMarketingEU

Email API comparison

SMTPfast vs Mailjet.

Developer email operations without Mailjet's broader campaign platform.

Mailjet combines transactional sending, SMTP relay, marketing campaigns, contacts, and collaborative email editing. SMTPfast is a narrower SES-backed product email layer with Resend-compatible sends, SMTP bridge, live logs, suppressions, forms, broadcasts, and account-safety controls.

SMTPfast

Simple monthly plans tied to product email volume.

Mailjet is broader; SMTPfast is simpler for engineering-owned product email.

Mailjet

Email-volume tiers for transactional and campaign sending.

Best for: Teams that want transactional and marketing email with EU-default positioning.

What SMTPfast adds

The useful differences for teams evaluating Mailjet.

  • Resend-compatible request shape for modern app migrations.
  • Live event tail and delivery debugging built around product email.
  • Warmup, spam flags, and account-safety workflows for SaaS senders.
  • SES-backed domain verification and custom MAIL FROM operations.

Short verdict

Choose Mailjet if you want one vendor for transactional email, SMTP, and collaborative marketing campaigns, especially with EU-default positioning. Choose SMTPfast if you want a focused SES-backed developer email layer with live logs, suppressions, Resend-compatible payloads, SMTP bridge, forms, and stronger SaaS safety workflows.

Try SMTPfast free
FeatureSMTPfastMailjet
Pricing modelSimple volume plansEmail-volume tiers with campaign features
Public free tier3,000 emails/month6,000 emails/month, 200/day
API & Sending
REST API
Resend-compatible payloads
SMTP relay
Batch sending
100/request
Idempotency keys
Inline images (cid) and automatic plain text
Not published
Customer webhooks
Share links for sent emails
Not published
Webhook event replay
Not published
Email metrics API
Marketing & Audience
Broadcast campaigns
Signup forms
Broken link check before sending
Not published
Workflow automation
Planned
Dynamic segments
Planned
Hosted templates
Visual editor
Deliverability & Safety
DKIM/SPF/DMARC guidance
Custom MAIL FROM
Suppression management
Live event tail
Warmup and abuse controls
Platform Model
Inbound email
Paid plans
Inboxes with threads and drafts
Paid plans
MCP server for AI agents
Not published
Terraform provider
Official
Not published
Agent skill for coding assistants
Official
Not published
API key scopes
Per key
Not published
Open source
Evaluating
Self-hostable
Evaluating
Team members and roles
Paid plans
Not published
No per-seat pricing

Choose Mailjet if

  • You need a collaborative visual editor and campaign tooling.
  • EU-default vendor positioning matters more than SES-backed operations.
  • You already use Mailjet for marketing and want transactional sends there too.

Choose SMTPfast if

  • Engineering owns email and wants a smaller surface to learn.
  • You want to see the full lifecycle of one message, including the steps that never reach a webhook.
  • You are migrating from a Resend-compatible payload and want the change to be the base URL and the key.

Migration checklist

  1. 1Separate Mailjet transactional sends from marketing campaign workflows.
  2. 2Create an SMTPfast account and generate an API key with email:send scope.
  3. 3Add and verify your sending domain with DKIM, SPF, DMARC, and MAIL FROM records.
  4. 4Send a low-volume test message and confirm events appear in the SMTPfast logs.
  5. 5Move production traffic gradually while watching bounces, complaints, and suppressions.
  6. 6Map Mailjet webhooks and contact state to SMTPfast events, contacts, and suppressions.

Frequently asked questions.

Is SMTPfast better than Mailjet?

Mailjet is stronger for combined transactional and campaign tooling with a collaborative editor. SMTPfast is stronger for focused SES-backed API/SMTP operations, live debugging, suppressions, and Resend-compatible migration.

When should I still choose Mailjet?

Choose Mailjet when its core strength matches your team: Teams that want transactional and marketing email with EU-default positioning. SMTPfast is a better fit when you want a developer-first SES-backed API with queues, webhooks, tracking, suppressions, and a focused dashboard already handled.

How hard is it to migrate from Mailjet to SMTPfast?

Most migrations start with domain verification, a test API key, and one low-risk transactional email path. Resend-compatible payloads are especially quick to move; older providers may require mapping template, webhook, and suppression behavior.