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Head-to-head · SMTP Relay Services

Postmark vs Mailjet

  • Updated Sep 2026
  • Both researched from official sources
  • 2 checks side by side
Higher score Postmark #2 in SMTP Relay Services 8.2/10 Free plan · paid from $15/mo Free plan✓ 0 of 3 features Visit Postmark
Mailjet #3 in SMTP Relay Services 7.7/10 Free plan · 30-day trial Free plan✓ 0 of 3 features Visit Mailjet

Postmark leads on 1 check, Mailjet on 0, and 1 is even. Who comes out ahead on the 2 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scorePostmark · 8.2/10
  • Free planboth

Postmark scores higher on our rubric for smtp relay services: 8.2 against 7.7 out of 10; our editors rank them #2 and #3.

Postmark leads on monthly send limit: 10000 emails/mo versus 8000 emails/mo.

Postmark is the better fit for transactional teams needing streams and templates. Mailjet is the better fit for teams combining relay and email marketing.

  • Postmark fits best

    Transactional teams needing streams and templates

  • Mailjet fits best

    Teams combining relay and email marketing

Advertiser disclosure: iTechGuides is reader-supported. We may earn a commission when you click some links. How we rank.

Side by side

Feature Postmark 8.2/10 Visit ↗ Mailjet 7.7/10 Visit ↗
At a glance
Editor score 8.2 7.7
Ranking #2 in SMTP Relay Services #3 in SMTP Relay Services
Best for Transactional teams needing streams and templates Teams combining relay and email marketing
Pricing model Free plan + paid Free plan + paid
Starting price $15/mo Not published
Free plan ✓ ✓
Free trial — —
Deployment Cloud Cloud
Platforms Web Web
Support Live chat, Docs Live chat, Phone, Tickets, Docs
Compliance GDPR, 2FA SOC 2, ISO 27001, GDPR, HIPAA, PCI DSS, SSO/SAML
Integrations 12 integrations 100+ integrations
Built for Solo, Small business, Mid-market, Enterprise Small business, Mid-market, Enterprise
Features Postmark 0/3 · Mailjet 0/3
Inbound email parsing Not published Not published
Event webhooks Not published Not published
Subaccounts Not published Not published
Specs
Monthly send limit 10000 emails/mo (best) 8000 emails/mo
Dedicated IP option Not published Not published
Email log retention Not published Not published
Our review
Pros
  • Separate transactional and broadcast message streams
  • Inbound parsing with JSON webhooks and delivery events
  • Reusable templates with previews, variables, and test sends
  • SMTP relay, REST API, and webhooks support transactional delivery
  • Automation, segmentation, A/B testing, and landing pages cover campaign needs
  • Integrations include HubSpot, Shopify, WordPress, and Microsoft Dynamics CRM
Cons
  • Free plan allows only 100 emails per month
  • Listed paid plans include 10,000 emails per month
  • Dedicated IPs are limited to eligible high-volume customers
  • The Free plan provides basic statistics rather than advanced reporting
  • Automation and A/B testing are listed on paid plans, not the Free plan
  • Its broad marketing scope may exceed the needs of relay-only teams
Our verdict

Postmark is an email delivery service for application teams sending transactional and broadcast messages through REST APIs or SMTP. It supports application email, individual or batch messages, reusable HTML and plain-text templates,…

Read the review →

Mailjet combines transactional email delivery and email marketing in one web and API-based platform. It is designed for marketing teams, developers, small and medium-sized businesses, and enterprises that need campaign creation alongside…

Read the review →
  1. PostmarkSMTP Relay Services 8.2Free plan · paid from $15/mo
  2. MailjetSMTP Relay Services 7.7Free plan · 30-day trial

Strengths and trade-offs

  • Postmark — where it wins

    • Separate transactional and broadcast message streams
    • Inbound parsing with JSON webhooks and delivery events
    • Reusable templates with previews, variables, and test sends

    Where it doesn't

    • Free plan allows only 100 emails per month
    • Listed paid plans include 10,000 emails per month
    • Dedicated IPs are limited to eligible high-volume customers

  • Mailjet — where it wins

    • SMTP relay, REST API, and webhooks support transactional delivery
    • Automation, segmentation, A/B testing, and landing pages cover campaign needs
    • Integrations include HubSpot, Shopify, WordPress, and Microsoft Dynamics CRM

    Where it doesn't

    • The Free plan provides basic statistics rather than advanced reporting
    • Automation and A/B testing are listed on paid plans, not the Free plan
    • Its broad marketing scope may exceed the needs of relay-only teams
  • Postmark8.2/10 · Free plan · paid from $15/mo

    A focused SMTP and API service for transactional email, streams, templates, and events.

    Visit PostmarkFull verdict →
  • Mailjet7.7/10 · Free plan · 30-day trial

    A broad email platform pairing SMTP relay with campaigns, automation, and analytics.

    Visit MailjetFull verdict →

More comparisons

All SMTP relay services comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Sep 2026

Last updated · How we research and update