FREEDOM251

Freedom251 › Marketing

Free and open first

Best Transactional Email Software in 2026

Transactional email software handles messages triggered by events in an app or service, such as account or activity updates. Compared on delivery methods and template options, the entries offer details to assess how messages are sent and prepared. Event webhooks and delivery log retention can help frame integration and record-keeping needs, while a dedicated IP option may also matter for your setup. Compare monthly send limits with free-plan availability and paid-from pricing to weigh capacity and cost. Mailchimp, Twilio Segment, and Maileroo are among the entries shown. Use these criteria to consider what your sending workflow requires.

  1. 1

    EmailSuccess

    by EmailSuccess
    Free plan APIMacSelf-hosted+2

    Choose EmailSuccess for enterprise gateways and high-volume SMTP operations that need delivery tuning, traffic controls, and email authentication features.

    7.6 Free plan Visit site
  2. 2

    Hyvor Relay

    by Hyvor Relay
    Free plan APISelf-hostedWeb

    Choose Hyvor Relay if you need a developer-focused email API with self-hosting, automation, and delivery event reporting.

    7.5 Free plan · paid from €30/mo Visit site
  3. 3

    Mailchimp

    by Mailchimp
    Free plan AndroidAPIiPhone+1

    Choose Mailchimp if you want email marketing with automation, segmentation and campaign testing in one service.

    7.5 Free plan · 14-day trial Visit site
  4. 4

    Aritic Mail

    by Aritic Mail
    Free plan APIWeb

    Aritic Mail focuses on transactional delivery with integration, monitoring, reporting, and inbound processing tools.

    7.4 From $9 Visit site
  5. 5

    Emailit

    Free plan APIWeb

    Emailit brings campaign tools, transactional delivery, inbound routing, integrations, and security controls together.

    7.3 From $20 Visit site
  6. 6

    MailerSend

    Free plan APIiPhoneWeb

    MailerSend combines transactional sending with tools for templates, monitoring and inbound reply handling. Review the Free plan and trial limits, and note that the mobile app is iOS-only.

    7.3 Free plan · paid from $7/mo · 14-day trial Visit site
  7. 7

    Mailmark

    by Mailmark
    Free plan APISelf-hostedWeb

    Mailmark covers operational email needs from DNS setup through campaigns and delivery monitoring. Its open-source, self-hosted model and developer APIs are balanced by plan-based sending limits.

    7.3 Free plan · paid from $10/mo · 7-day trial Visit site
  8. 8

    Maileroo

    by Maileroo
    Free plan APIWeb

    Maileroo combines sending, inbound handling, testing and delivery analytics in web and API access. Review the monthly and hourly limits against your sending needs before choosing a plan.

    7.2 Free plan Visit site
  9. 9

    Plunk

    Free plan APISelf-hostedWeb

    Choose Plunk if you want transactional email, campaigns and event-based workflows in one platform, with API, SMTP and self-hosting options.

    7.2 Free plan · paid from $0.00 Visit site
  10. 10

    Posta

    Free plan APISelf-hostedWeb

    Choose Posta if your team can run email infrastructure and wants API sending, SMTP relay, inbound mail, templates, and webhooks in one platform.

    7.2 Open source Visit site
  11. 11

    ReachMail

    by ReachMail
    Free plan AndroidAPIiPhone+1

    ReachMail brings campaign creation, audience tools, automation, and transactional relay into one service. Its free plan has stated contact and email limits, while paid plans start at $8/mo.

    7.2 Free plan · paid from $8/mo · 14-day trial Visit site
  12. 12

    MailsSetu

    Free plan APIWeb

    Choose MailsSetu if you need transactional email with API or SMTP access, operational logs, templates, and delivery events.

    7.1 Free plan · paid from ₹399/mo Visit site
  13. 13

    Netcore Email API

    by Netcore Email API
    Free plan APIWeb

    Choose Netcore Email API if your business needs transactional or triggered email with API controls, delivery visibility, and sender-reputation tools.

    7.1 Free plan Visit site
  14. 14

    Nuntly

    by Nuntly
    Free plan APIWeb

    Nuntly covers outbound and inbound transactional email with APIs, SDKs, and webhook-based visibility.

    7.1 Free plan · paid from €10/mo Visit site
  15. 15

    QQueue

    Free plan APISelf-hostedWeb

    QQueue combines campaign and transactional email with self-hosted control, tracking, and webhook support.

    7.1 Free plan Visit site
  16. 16

    Pombo

    Free plan APIWeb

    Choose Pombo if you need marketing, lifecycle, or transactional email with AI-assisted campaign creation and approval before sending.

    7.0 Free plan · paid from $29/mo Visit site
  17. 17

    Postmark

    by Postmark
    Free plan APIWeb

    Postmark offers application email delivery, tracking, and inbound processing with a permanent but limited free tier.

    7.0 Free plan · paid from $15/mo Visit site
  18. 18

    turboSMTP

    by turboSMTP
    Free plan AndroidAPIiPhone+4

    turboSMTP combines SMTP delivery, campaign tools, and message tracking, with plans ranging from a time-limited free option to paid monthly plans.

    7.0 From €14.95/mo Visit site
  19. 19

    Resend Broadcasts

    by Resend Broadcasts
    Free plan APIWeb

    Resend Broadcasts combines a visual editor, scheduling, contact-level tracking and API controls for campaigns to existing contacts.

    6.9 Free plan · paid from $20/mo Visit site
  20. 20

    Posthawk

    by Posthawk
    Free plan Self-hosted

    Choose Posthawk if you need an email delivery service with multiple sending methods, templates, webhooks, and a choice of managed or self-hosted deployment.

    6.8 Free plan · paid from $20/mo Visit site
  21. 21

    Reloop

    Free plan Self-hosted

    Reloop provides multiple delivery routes, developer integrations, and hosted or self-hosted operation. Check the Free plan caps and hosted resource limits when choosing a setup.

    6.8 Free plan · paid from $10/mo Visit site
  22. 22

    SMTP2GO

    Free plan APIWeb

    SMTP2GO combines SMTP and API delivery with event reporting, authentication and integrations.

    6.7 Free plan · paid from $10/mo Visit site
  23. 23

    Waypoint

    Free plan APIWeb

    Waypoint pairs an email API with visual template editing and activity logs for transactional messaging teams. Its stated exclusions and plan limits matter when matching it to a sending workflow.

    6.6 Free plan · paid from $20/mo Visit site
  24. 24

    Twilio SendGrid

    by Twilio SendGrid
    Free plan API

    Twilio SendGrid provides several sending interfaces, developer libraries, message tools, and delivery tracking.

    6.5 From $19.95/mo · 60-day trial Visit site
  25. 25

    Mailgun

    Free plan Web

    Mailgun offers API and SMTP email sending alongside inbound routing and monitoring features.

    6.4 Free plan · 30-day trial Visit site

#1Places #1, #2, #3, #4, #5 on this list can be bought by the makers of the software on it. See the price

More in Marketing