Mailjet vs Resend
Compare Mailjet and Resend based on observed API performance, features, and pricing
Live performance comparison
Real-world performance data from messages sent through Knock
| Provider | Message volume | Growth | Status page updates (30d) | Status page updates (90d) |
|---|---|---|---|---|
 | <1M | 6th of 10 ↓ | 0 | 0 |
 | 10M–25M | 1st of 10 → | 9 | 33 |
From January 1st to March 31st, Knock routed <1M messages through Mailjet and 10M–25M through Resend. Mailjet reported 0 status page updates over the last 90 days, while Resend reported 33.
Response time
Response time measures how long each provider takes to accept an API request from Knock, including connection overhead and any automatic retries. Lower values mean faster message hand-off.
The chart above shows each provider's daily median response time (p50) from January 1st to March 31st. The top-line number is an average of these daily values: Mailjet averaged 414ms compared to 78ms for Resend. Mailjet's highest daily p50 was 490ms; Resend's was 118ms. Resend is 336ms faster at the median, which can add up at high volumes.
The 90th percentile (p90) captures the slowest 10% of requests, revealing how each provider handles moderate stress. Averaged across all days, Mailjet has a p90 of 532ms compared to 128ms for Resend. The highest daily p90 was 652ms for Mailjet and 175ms for Resend. Resend handles these slower requests 404ms faster, suggesting more consistent performance across the board.
The 99th percentile (p99) represents the long tail — the slowest 1% of requests. Averaged across all days, Mailjet reached 710ms at p99 while Resend reached 354ms. The highest daily p99 was 5110ms for Mailjet and 10020ms for Resend, indicating the worst-case response time during spikes or provider-side congestion. Resend shows a tighter tail, which may matter for time-sensitive notifications like one-time passwords or real-time alerts where even rare delays can impact user experience.
Error rate
Error rate tracks the ratio of 5xx responses and timeouts to total requests. Knock automatically retries failed requests, so transient provider errors rarely affect end-user delivery.
| Provider | Avg. daily error rate | Highest daily rate | Peak error date | Zero-error days | Days above 0.01% |
|---|---|---|---|---|---|
| 0.00% | 0.12% | Feb 23 | 88 | 2 |
| 0.08% | 2.45% | Feb 15 | 78 | 8 |
Averaged across the date range, Mailjet shows a 0.00% daily error rate compared to 0.08% for Resend. The highest single-day error rate was 0.12% for Mailjet and 2.45% for Resend. Mailjet demonstrates a lower error rate, indicating slightly more consistent availability during this period. Knock automatically retries failed requests to both providers, minimizing the impact of transient errors on end-user delivery.
About these metrics: Data represents messages sent through Knock during the specified period. Response time measures time from Knock to provider acceptance. Error rate includes only provider 5xx responses and timeouts.
Recent Mailjet incidents
Recent status page incidents for Mailjet
No incidents reported in the last 90 days
Recent Resend incidents
Recent status page incidents for Resend
Started Mar 28, 2026 — Resolved Mar 28, 2026
Status: Resolved We have resolved the issue causing increased latency in email sending. Emails are being delivered normally. Affected components Single Email (Operational) Broadcast Emails (Operational) Batch Emails (Operational)
Started Mar 26, 2026 — Resolved Mar 26, 2026
Status: Resolved Our systems have caught up and email events are processing normally. No emails were lost or delayed during this time. Affected components Email Events (Operational)
Started Mar 24, 2026 — Resolved Mar 24, 2026
Status: Resolved We have resolved the underlying issue and service has been resumed.
Started Mar 20, 2026 — Resolved Mar 20, 2026
Status: Resolved We have resolved the underlying issue and service has been resumed. Affected components Email Events (Operational)
Started Mar 20, 2026 — Resolved Mar 20, 2026
Status: Complete The maintenance was completed. We're working through some backlogged Email Events. Affected components Dashboard (Operational) Email Events (Operational) General API (Operational) Webhooks (Operational)
Pros and cons
Mailjet
Resend
Pros
- Hybrid support for both marketers and developers in a single platform
- Unique real-time collaboration features for team-based template editing
- EU-only data processing for companies with strict data residency requirements
- Powers email delivery for over 130,000 companies including Microsoft and DHL
Pros
- Beautiful documentation with attention to detail and great developer experience
- Created and maintain React Email, the go-to framework for building email templates in React
- Minimalist, developer-optimized platform that avoids bloat with a focused UI
- Transparent observability with real-time visibility into sends, failures, and engagement
Cons
- Activated automation workflows cannot be edited, requiring new workflows for any changes
- Some analytics and deliverability tools are locked behind higher pricing plans
- Deliverability can lag behind specialists like Postmark
Cons
- Newer and less battle-tested compared to incumbents like Mailgun or SendGrid
- Fewer enterprise features than established providers
- Limited marketing email capabilities
Frequently asked questions
What is the difference between Mailjet and Resend?
Mailjet is a collaborative email platform with real-time editing and combined transactional and marketing capabilities. Resend is a modern email API built for developers, with React Email support and a focus on simplicity. Mailjet is best suited for team collaboration + marketing, while Resend is geared toward developer-first, react teams.
Which is cheaper, Mailjet or Resend?
Free tier includes 200 emails per day (6,000/month). Paid plans start at $17/month for 15,000 emails with no daily limit. Premium plans start at $105/month for 100,000 emails. Free tier includes 3,000 emails per month and 100 emails per day. Paid plans start at $20/month for 50,000 emails with overages at $0.90/1K on Pro, scaling down to $0.46/1K on Scale 2.5M. The best value depends on your sending volume. Use the pricing calculator above to compare costs at your expected volume.
Which is faster, Mailjet or Resend?
Based on real-world data from Knock, Mailjet has a median API response time (p50) of 414ms compared to 78ms for Resend.
Which is more reliable, Mailjet or Resend?
From January 1st to March 31st, Mailjet showed an error rate of 0.00% while Resend showed 0.08%. Both rates are within acceptable thresholds for production email delivery, and Knock automatically retries failed requests to minimize the impact of transient errors.
Which is more popular, Mailjet or Resend?
On the Knock platform, Mailjet handled <1M messages from January 1st to March 31st compared to 10M–25M for Resend. Mailjet is currently seeing declining volume, while Resend volume has remained stable.
Can I use both Mailjet and Resend together?
Yes. Knock enables you to integrate multiple email providers into a single notification workflow. You can use Mailjet and Resend side by side, route traffic between them, or migrate from one to the other without changing your application code.
What are the main pros and cons of Mailjet vs Resend?
Mailjet strengths include hybrid support for both marketers and developers in a single platform and unique real-time collaboration features for team-based template editing. Resend strengths include beautiful documentation with attention to detail and great developer experience and created and maintain react email, the go-to framework for building email templates in react. On the other hand, Mailjet drawbacks include activated automation workflows cannot be edited, requiring new workflows for any changes, while Resend drawbacks include newer and less battle-tested compared to incumbents like mailgun or sendgrid.
Use either provider with Knock
Knock enables you to integrate Mailjet, Resend, or any combination of email providers into a single notification workflow. Manage templates, orchestrate cross-channel delivery, and switch providers without changing your code.