MailerSend vs Postmark
MailerSend and Postmark are both popular choices in the transactional email service space. Postmark has been around since 2009, giving it a 11-year head start over MailerSend (founded 2020). MailerSend is the more affordable option at $7/mo — that's $8 less per month than Postmark's $15/mo entry point. Both offer free plans to get started. MailerSend has the edge with A/B testing, SMS marketing, a drag-and-drop editor.
Quick Verdict
MailerSend wins on price.
Postmark wins on deliverability, rating, integrations.
Best for most users: Postmark (saas applications).
MailerSend
Developer-friendly transactional email by the MailerLite team
MailerSend is a transactional email service built by the team behind MailerLite, launched in 2020 with over a decade of email deliverability expertise. It offers a polished developer experience with a full API, SMTP relay, drag-and-drop template builder, and SMS capabilities, making it an ideal choice for SaaS and app developers who need reliable transactional email delivery without the complexity of AWS.
Postmark
Transactional email with exceptional deliverability, now by ActiveCampaign
Postmark, originally built by Wildbit and acquired by ActiveCampaign in 2022, is a transactional email service laser-focused on deliverability and speed. It consistently achieves near-99% inbox placement rates and processes emails in sub-second times, making it the top choice for developers who refuse to compromise on email reaching the inbox.
Feature Comparison
| Feature | MailerSend | Postmark |
|---|---|---|
| Rating | 4.2/5 | 4.6/5 |
| Starting Price | $7/mo | $15/mo |
| Free Plan | 500 emails/month (100/day max), 1 domain, 1 template | 100 emails/month, never expires, test integration and side projects |
| Founded | 2020 | 2009 |
| Email Templates | 90 | 20 |
| Integrations | 29 | 30 |
| Deliverability Rate | 86.8% | 98.7% |
| Marketing Automation | ✕ | ✕ |
| A/B Testing | ✓ | ✕ |
| Landing Pages | ✕ | ✕ |
| Segmentation | ✕ | ✕ |
| Drag & Drop Editor | ✓ | ✕ |
| SMS Marketing | ✓ | ✕ |
| Ecommerce Features | ✕ | ✕ |
| API Access | ✓ | ✓ |
| Multi-Language | ✕ | ✕ |
| Web Push Notifications | ✕ | ✕ |
| Live Chat | ✓ | ✕ |
| Advanced Analytics | ✓ | ✓ |
MailerSend: Pros & Cons
Pros
- +Excellent developer experience with SDKs for Node.js, Python, Java, Laravel, PHP, Go, and Ruby
- +Strong deliverability averaging 86.8% inbox placement in EmailToolTester third-party tests (2nd best tested)
- +Intuitive drag-and-drop email builder with 90+ pre-built content blocks for quick template creation
- +Built by the MailerLite team with 10+ years of email deliverability expertise behind the platform
- +Includes SMS API for US and Canada on Starter plans and above at no extra base cost
Cons
- −Free plan reduced from 3,000 to just 500 emails/month in October 2025, with 100/day cap
- −No marketing automation or campaign features; purely transactional and lacks segmentation tools
- −Starter and Professional plans both start at $25/month for same 50,000 emails, confusing tier differentiation
- −Some users report sudden account suspensions for high bounce rates with no refunds offered
- −Pricing can become expensive at scale compared to Amazon SES or Elastic Email ($0.90 per 1,000 overage)
Postmark: Pros & Cons
Pros
- +Industry-leading deliverability rates — 98.7% inbox placement confirmed in third-party tests by Hackceleration (2026)
- +Extremely fast email delivery with sub-second processing times for transactional messages
- +Clean, intuitive dashboard with detailed delivery analytics including bounce tracking, spam complaints, and open rates
- +Pre-built responsive HTML templates for common transactional emails (welcome, password reset, receipts, invoices)
- +Simple, volume-based pricing with no hidden fees — free tier never expires and is great for testing
Cons
- −Very limited free tier at only 100 emails/month compared to competitors offering thousands
- −No marketing email features — strictly transactional and broadcast; no automation, sequences, or segmentation
- −Some users report customer service quality declined after the ActiveCampaign acquisition in 2022
- −No built-in drag-and-drop email editor; templates require HTML knowledge to customize
- −Overage rates ($1.20-$1.80 per 1,000) can add up quickly for unpredictable sending volumes
The Verdict
Postmark edges ahead with a 4.6/5 rating compared to MailerSend's 4.2/5. The gap comes mainly from deliverability (5 vs 3.2) and value for money (5 vs 4.9). On deliverability, Postmark reports 98.7% compared to 86.8% for MailerSend — a meaningful difference if inbox placement is critical for your campaigns.
| Criterion | Weight | MailerSend | Postmark |
|---|---|---|---|
| Starting Price | 30% | $7/mo | $15/mo |
| Deliverability | 25% | 86.8% | 98.7% |
| Rating | 25% | 4.2/5 | 4.6/5 |
| Integrations | 10% | 29 | 30 |
| Free Tier | 10% | Yes | Yes |
Weights determine how much each criterion counts toward the final score. See full methodology
Choose MailerSend if…
- + You want lower starting costs ($7/mo)
- + You need SMS marketing
- + You need A/B testing
- + You're a developers building transactional email flows
Choose Postmark if…
- + You're a saas applications
- + You're a transactional email senders
- + Industry-leading deliverability rates — 98.7% inbox placement confirmed in third-party tests by Hackceleration (2026)