Mailjet vs Mandrill
Compare Mailjet and Mandrill 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 |
 | 1M–10M | 8th of 10 ↑ | 0 | 0 |
From December 12th to March 12th, Knock routed <1M messages through Mailjet and 1M–10M through Mandrill. Mailjet reported 0 status page updates over the last 90 days, while Mandrill reported 0.
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 December 12th to March 12th. The top-line number is an average of these daily values: Mailjet averaged 408ms compared to 127ms for Mandrill. Mailjet's highest daily p50 was 491ms; Mandrill's was 238ms. Mandrill is 281ms 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 525ms compared to 385ms for Mandrill. The highest daily p90 was 593ms for Mailjet and 527ms for Mandrill. Mandrill handles these slower requests 140ms 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 701ms at p99 while Mandrill reached 788ms. The highest daily p99 was 5104ms for Mailjet and 4845ms for Mandrill, indicating the worst-case response time during spikes or provider-side congestion. Mailjet 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 | 90 | 1 |
| 0.00% | 0.22% | Feb 2 | 88 | 2 |
Averaged across the date range, Mailjet shows a 0.00% daily error rate compared to 0.00% for Mandrill. The highest single-day error rate was 0.12% for Mailjet and 0.22% for Mandrill. 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
Status page incidents from the last 30 days for Mailjet
No incidents reported in the last 30 days
Recent Mandrill incidents
Status page incidents from the last 30 days for Mandrill
No incidents reported in the last 30 days
Pros and cons
Mailjet
Mandrill
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
- Friendly, well-laid-out developer documentation that makes integration straightforward
- Global infrastructure for fast delivery with dedicated IPs and IP address pools
- Solid analytics with reports on deliverability, opens, clicks, bounces, and rejections
- Reuse Mailchimp templates for transactional email with deep ecosystem integration
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
- Requires an existing Mailchimp Standard or Premium subscription
- Not available as a standalone service
- Higher cost than some dedicated transactional services
Frequently asked questions
What is the difference between Mailjet and Mandrill?
Mailjet is a collaborative email platform with real-time editing and combined transactional and marketing capabilities. Mandrill is a transactional email add-on for Mailchimp, suited for teams already using the Mailchimp platform. Mailjet is best suited for team collaboration + marketing, while Mandrill is geared toward mailchimp users needing transactional.
Which is cheaper, Mailjet or Mandrill?
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. Included as an add-on to Mailchimp Standard or Premium plans. Pricing is based on email blocks of 25,000 emails, starting at $20/block. Volume discounts apply: $18/block above 500K, scaling down to $10/block above 4M. 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 Mandrill?
Based on real-world data from Knock, Mailjet has a median API response time (p50) of 408ms compared to 127ms for Mandrill.
Which is more reliable, Mailjet or Mandrill?
From December 12th to March 12th, Mailjet showed an error rate of 0.00% while Mandrill showed 0.00%. 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 Mandrill?
On the Knock platform, Mailjet handled <1M messages from December 12th to March 12th compared to 1M–10M for Mandrill. Mailjet is currently seeing declining volume, while Mandrill is trending upward.
Can I use both Mailjet and Mandrill together?
Yes. Knock enables you to integrate multiple email providers into a single notification workflow. You can use Mailjet and Mandrill 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 Mandrill?
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. Mandrill strengths include friendly, well-laid-out developer documentation that makes integration straightforward and global infrastructure for fast delivery with dedicated ips and ip address pools. On the other hand, Mailjet drawbacks include activated automation workflows cannot be edited, requiring new workflows for any changes, while Mandrill drawbacks include requires an existing mailchimp standard or premium subscription.
Use either provider with Knock
Knock enables you to integrate Mailjet, Mandrill, or any combination of email providers into a single notification workflow. Manage templates, orchestrate cross-channel delivery, and switch providers without changing your code.