MailerSend API
performance benchmarks
Browse MailerSend's observed email API response time, error rates, and incident history over the last 90 days.
Live performance metrics
Real-world performance data from messages sent through Knock.
| Message volume | Growth | Status page updates (30d) | Status page updates (90d) |
|---|---|---|---|
<1M | 8th of 10 → | 0 | 2 |
From August 13th to November 11th, Knock routed <1M messages through MailerSend. For adoption, MailerSend ranks 8th of 10 providers based on new channel connections, with adoption holding steady over the period. MailerSend reported 2 status page updates over the last 90 days, 0 of which were in the last 30 days.
MailerSend response time
Response time measures how long MailerSend takes to accept an API request from Knock, including connection overhead and any automatic retries. Lower values mean faster message hand-off.
| Median (p50) | p90 | p95 | p99 |
|---|---|---|---|
269ms | 467ms | 696ms | 1635ms |
From August 13th to November 11th, MailerSend averaged a daily median response time (p50) of 269ms across all days in the range, meaning half of all requests on a typical day complete in under 269ms. The 99th percentile averaged 1635ms, with a peak daily p99 of 43537ms. This is slightly higher than some providers, which may reflect additional processing MailerSend performs on message acceptance.
MailerSend 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.
| Avg. daily error rate | Highest daily rate | Peak error date | Zero-error days | Days above 0.01% |
|---|---|---|---|---|
0.00% | 0.00% | Aug 13 | 91 | 0 |
From August 13th to November 11th, MailerSend averaged a 0.00% daily error rate for 5xx responses and timeouts, with the highest single-day error rate reaching 0.00%. This is one of the lowest error rates among providers on Knock, indicating strong reliability and consistent uptime. Knock automatically retries failed requests, so transient provider errors rarely affect end-user delivery.
About these metrics: Data represents messages sent through Knock to MailerSend during the specified period. Response time measures time from Knock to provider acceptance. Error rate includes only provider 5xx responses and timeouts.
Recent MailerSend incidents
Recent status page incidents for MailerSend
Started Oct 11, 2026 — Resolved Oct 11, 2026
Status: Complete (Sun, 11 Oct 2026 07:10:00 GMT - Sun, 11 Oct 2026 07:40:00 GMT) Maintenance has completed Affected components Bulk endpoint (Operational) SMTP (Operational) Email activity (Operational) Delivery time (Operational) Email sending API (Operational) Email analytics (Operational) Deliverability rate (Operational) MailerSend APP (Operational)
Started Sep 21, 2026 — Resolved Sep 21, 2026
Status: Complete (Mon, 21 Sep 2026 07:00:00 GMT - Mon, 21 Sep 2026 07:05:00 GMT) Maintenance has completed Affected components Bulk endpoint (Operational) SMTP (Operational) Delivery time (Operational) Email sending API (Operational) Inbound routing (Operational)
MailerSend pricing calculator
See how MailerSend's monthly cost changes as your email volume grows.
Compare MailerSend with other providers
See how MailerSend compares on performance, reliability, and pricing.
About MailerSend
Mailersend is an intuitive transactional email and SMS service by Mailgun, designed for growing businesses.
Pros
- Designed for both developers and business users with API and visual editor
- Modern, intuitive UI that is easier to navigate than older platforms
- Multi-channel support with native email and SMS transactional messaging
- Affordable Hobby plan at $7/month for 5,000 emails with low overage rates
Cons
- Available integrations with other tools are basic and limited
- Fewer advanced features than enterprise platforms
- Smaller ecosystem compared to established competitors
Frequently asked questions
MailerSend is an email service provider commonly used for transactional email for saas, e-commerce order notifications, account management emails. Mailersend is an intuitive transactional email and SMS service by Mailgun, designed for growing businesses.
Free tier includes 500 emails per month. Hobby is $7/month for 5,000 emails, with extra email at $1.50 per 1,000, and does not extend to 50,000 emails. Starter starts at $35/month for 50,000 emails and ends at 1 million. Professional starts at $110/month and published pricing ends at 2 million. MailerSend offers a free tier with up to 500 emails, with a hard sending limit on that plan.
Based on real-world data from messages sent through Knock, MailerSend accepts API requests with a median response time of 269ms (p50) and 1635ms at the 99th percentile.
From August 13th to November 11th, MailerSend showed an error rate of 0.00% for 5xx responses and timeouts across <1M messages sent through Knock. Knock automatically retries failed requests, so transient provider errors rarely affect end-user delivery.
Key strengths include designed for both developers and business users with api and visual editor and modern, intuitive ui that is easier to navigate than older platforms. On the other hand, available integrations with other tools are basic and limited and fewer advanced features than enterprise platforms.
Yes. Knock has a native MailerSend integration that enables you to send email notifications through MailerSend as part of a cross-channel workflow. You can combine MailerSend with other channels like in-app feeds, push, SMS, and Slack from a single API call.