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Head-to-head · SMTP Relay Services

Mailjet vs UniOne

  • Updated Oct 2026
  • Both researched from official sources
  • 4 checks side by side
Higher score Mailjet #3 in SMTP Relay Services 8.7/10 Free plan · 30-day trial Free planFree trial✓ 0 of 3 features Visit Mailjet
UniOne #8 in SMTP Relay Services 7.7/10 Paid ✓ 2 of 3 features Visit UniOne

Mailjet leads on 2 checks, UniOne on 0, and 2 are even. Who comes out ahead on the 4 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreMailjet · 8.7/10
  • Free planonly Mailjet
  • Free trialonly Mailjet
  • Most featuresUniOne · 2 of 3

Mailjet scores higher on our rubric for smtp relay services: 8.7 against 7.7 out of 10; our editors rank them #3 and #8.

Mailjet offers free plan; UniOne doesn't. Mailjet leads on monthly send limit: 8000 emails/mo versus 6000 emails/mo.

Mailjet is the better fit for teams combining relay and email marketing. UniOne is the better fit for small senders wanting inexpensive API and SMTP access.

  • Mailjet fits best

    Teams combining relay and email marketing

  • UniOne fits best

    Small senders wanting inexpensive API and SMTP access

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Side by side

Feature Mailjet 8.7/10 Visit ↗ UniOne 7.7/10 Visit ↗
At a glance
Editor score 8.7 7.7
Ranking #3 in SMTP Relay Services #8 in SMTP Relay Services
Best for Teams combining relay and email marketing Small senders wanting inexpensive API and SMTP access
Pricing model Free plan + paid Paid
Starting price — $6/mo
Free plan ✓ (best) —
Free trial 30 days —
Deployment Cloud Cloud
Platforms Web Web
Support Live chat, Phone, Tickets, Docs Email, Live chat, Docs · 24/7
Compliance SOC 2, ISO 27001, GDPR, HIPAA, PCI DSS, SSO/SAML GDPR, 2FA
Integrations 100+ integrations 5 integrations
Built for Small business, Mid-market, Enterprise Small business, Mid-market, Enterprise
Features Mailjet 0/3 · UniOne 2/3
Inbound email parsing Not checked yet Not checked yet
Event webhooks Not checked yet ✓ (best)
Subaccounts Not checked yet ✓ (best)
Specs
Monthly send limit 8000 emails/mo (best) 6000 emails/mo
Dedicated IP option Not checked yet Dedicated
Email log retention Not checked yet 45 days
Our review
Pros
  • 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
  • SMTP API and REST/Web API support transactional and bulk email
  • Webhooks, tracking, templates, and validation support delivery operations
  • Separate projects, authentication, and dedicated IPs support account management
Cons
  • 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
  • The $0 trial is limited to four months and 6,000 monthly emails
  • The Standard plan is listed separately at $6 per month
  • Custom-volume features and priority support require the Individual plan
Our verdict

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 →

UniOne is an API-powered email delivery service for transactional and bulk marketing communications. It supports SMTP and Web API sending, templates, visual email creation, event tracking, suppression management, domain authentication,…

Read the review →
  1. MailjetSMTP Relay Services 8.7Free plan · 30-day trial
  2. UniOneSMTP Relay Services 7.7Paid

Strengths and trade-offs

  • 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

  • UniOne — where it wins

    • SMTP API and REST/Web API support transactional and bulk email
    • Webhooks, tracking, templates, and validation support delivery operations
    • Separate projects, authentication, and dedicated IPs support account management

    Where it doesn't

    • The $0 trial is limited to four months and 6,000 monthly emails
    • The Standard plan is listed separately at $6 per month
    • Custom-volume features and priority support require the Individual plan
  • Mailjet8.7/10 · Free plan · 30-day trial

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

    Visit MailjetFull verdict →
  • UniOne7.7/10 · Paid

    Affordable SMTP and API delivery with useful tracking, validation, and project controls.

    Visit UniOneFull verdict →

More comparisons

All SMTP relay services comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update