Mailersend
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 | 9th of 10 ↓ | 2 | 2 |
From December 12th to March 12th, Knock routed <1M messages through Mailersend. For adoption, Mailersend ranks 9th of 10 providers based on new channel connections, with adoption slowing over the period. Mailersend reported 2 status page updates over the last 90 days, 2 of which were in the last 30 days.
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 |
|---|---|---|---|
264ms | 551ms | 593ms | 807ms |
From December 12th to March 12th, Mailersend averaged a daily median response time (p50) of 264ms across all days in the range, meaning half of all requests on a typical day complete in under 264ms. The 99th percentile averaged 807ms, with a peak daily p99 of 12094ms. This is slightly higher than some providers, which may reflect additional processing Mailersend performs on message acceptance.
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% |
|---|---|---|---|---|
0.01% | 0.06% | Feb 18 | 84 | 4 |
From December 12th to March 12th, Mailersend averaged a 0.01% daily error rate for 5xx responses and timeouts, with the highest single-day error rate reaching 0.06%. 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
Status page incidents from the last 30 days for Mailersend
Started Mar 3, 2026 — Resolved Mar 3, 2026
Status: Complete Maintenance has completed Affected components Bulk endpoint (Under maintenance) SMTP (Under maintenance) Delivery time (Under maintenance) Email sending API (Under maintenance) Deliverability rate (Under maintenance)
Started Feb 19, 2026 — Resolved Feb 19, 2026
Status: Resolved The issue has been resolved and systems have returned to normal. We’ll continue monitoring to ensure ongoing stability. Thank you for your patience. Affected components MailerSend APP (Operational)
Compare Mailersend with other providers
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
What is Mailersend?
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.
How much does Mailersend cost?
Free tier includes 500 emails per month. Paid plans start at $7/month for 5,000 emails on the Hobby plan, with the Starter plan at $35/month for 50,000 emails. Mailersend offers a free tier with up to 500 emails, with a hard sending limit on that plan.
How fast is Mailersend?
Based on real-world data from messages sent through Knock, Mailersend accepts API requests with a median response time of 264ms (p50) and 807ms at the 99th percentile.
How reliable is Mailersend?
From December 12th to March 12th, Mailersend showed an error rate of 0.01% 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.
What are the pros and cons of Mailersend?
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.
Does Mailersend work with Knock?
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.
Use Mailersend with Knock
Knock enables you to integrate Mailersend alongside other notification channels, manage templates, and orchestrate cross-channel workflows from a single platform.