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 | 1 |
| 10M–25M | 1st of 10 → | 10 | 10 |
From May 3rd to August 1st, Knock routed <1M messages through Mailjet and 10M–25M through Resend. Mailjet reported 1 status page update over the last 90 days, while Resend reported 10.
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 May 3rd to August 1st. The top-line number is an average of these daily values: Mailjet averaged 405ms compared to 96ms for Resend. Mailjet's highest daily p50 was 479ms; Resend's was 122ms. Resend is 309ms 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 577ms compared to 168ms for Resend. The highest daily p90 was 20290ms for Mailjet and 221ms for Resend. Resend handles these slower requests 409ms 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 5105ms at p99 while Resend reached 486ms. The highest daily p99 was 20295ms for Mailjet and 10906ms 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% |
|---|---|---|---|---|---|
| 0.02% | 12.82% | Aug 1 | 85 | 6 |
| 0.05% | 3.52% | Jul 29 | 83 | 5 |
Averaged across the date range, Mailjet shows a 0.02% daily error rate compared to 0.05% for Resend. The highest single-day error rate was 12.82% for Mailjet and 3.52% for Resend. Both providers show similar reliability levels, with error rates well within acceptable thresholds. 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
Started Jun 5, 2026 — Resolved Jun 5, 2026
Jun 5, 10:33 UTC Resolved - This incident has been resolved. Jun 5, 10:26 UTC Monitoring - A fix has been implemented and we are monitoring the results. Jun 5, 10:25 UTC Identified - The issue has been identified and a fix is being implemented. Jun 5, 10:01 UTC Investigating - We are currently investigating this issue.
Recent Resend incidents
Recent status page incidents for Resend
Started Jul 30, 2026 — Resolved Jul 30, 2026
Status: Resolved We have resolved the underlying issue, and service has resumed. Domain verification has been restored, and affected verifications were re-triggered. Affected components Dashboard (Operational) General API (Operational)
Started Jul 29, 2026 — Resolved Jul 29, 2026
Status: Resolved Between 20:15 and 20:16 UTC, a brief database disruption caused elevated error rates for approximately 45 seconds. During this window, requests to the Resend API, SMTP relay, and dashboard may have returned 5xx errors or timed out. The issue resolved automatically at 20:16 UTC and all services have been operating normally since. Any request that failed during this window can be safely retried. Emails that had already been accepted before the disruption were not lost. They were
Started Jul 29, 2026 — Resolved Jul 29, 2026
Status: Resolved We have resolved the underlying issue and service has been resumed. Affected components Batch Emails (Operational) General API (Operational) Single Email (Operational) Broadcast Emails (Operational)
Started Jul 22, 2026 — Resolved Jul 22, 2026
Status: Resolved We have resolved the underlying issue and service has been resumed. Affected components Broadcast Emails (Operational) Webhooks (Operational) Automations (Operational) Single Email (Operational) Email Events (Operational) Batch Emails (Operational) General API (Operational) Website (Operational) Dashboard (Operational) SMTP (Operational)
Started Jul 21, 2026 — Resolved Jul 21, 2026
Status: Resolved Delivery to Microsoft has returned to normal. Thank you for your patience as we worked with them regarding this.
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 405ms compared to 96ms for Resend.
Which is more reliable, Mailjet or Resend?
From May 3rd to August 1st, Mailjet showed an error rate of 0.02% while Resend showed 0.05%. 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 May 3rd to August 1st compared to 10M–25M for Resend. Mailjet volume has remained stable, 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.