Best Transactional Email Software in 2026
Updated
In short: turboSMTP is ranked #1 of 41 as of 7 October 2026, ahead of Mailchimp and Twilio Segment. The best-ranked option with a free plan is Mailchimp. The lowest first paid tier on this page is Postmark at $5/mo.
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.
41 transactional email software ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
19 of the 25 here have a free tier you can use, 0 have open-source code on record, and 0 have full bars: free, open, on most of your devices and documented.
| # | App | Signal | Free tier | Open code | Devices | From | Score |
|---|---|---|---|---|---|---|---|
| 1 | turboSMTPWeb · Android · iPhone · API | Three bars | — | 3 of 6 | €14.95/mo | 6.6 | |
| 2 | MailchimpWeb · Android · iPhone | Three bars | — | 3 of 6 | Free | 6.5 | |
| 3 | Twilio SegmentWeb · Android · iPhone | Three bars | — | 3 of 6 | $120/mo | 6.5 | |
| 4 | MailerooWeb · API | Two bars | — | 1 of 6 | $10/mo | 6.4 | |
| 5 | MailerSendWeb · iPhone · API | Two bars | — | 2 of 6 | $5.60/mo | 6.4 | |
| 6 | NuntlyWeb · API | Two bars | — | 1 of 6 | €10/mo | 6.4 | |
| 7 | PostmarkWeb · API | Two bars | — | 1 of 6 | $5/mo | 6.4 | |
| 8 | Resend BroadcastsWeb · API | Two bars | — | 1 of 6 | $20/mo | 6.4 | |
| 9 | SMTP2GOWeb · API | Two bars | — | 1 of 6 | $8.33/mo | 6.4 | |
| 10 | EmailSuccessWeb | Two bars | — | 1 of 6 | Free | 6.3 | |
| 11 | Hyvor RelayWeb · Self-hosted · API | Two bars | — | 1 of 6 | Free | 6.3 | |
| 12 | PosthawkSelf-hosted | Two bars | — | 0 of 6 | $20/mo | 6.3 | |
| 13 | ReloopSelf-hosted | Two bars | — | 0 of 6 | $10/mo | 6.3 | |
| 14 | Twilio SendGridAPI | Two bars | — | 0 of 6 | $19.95/mo | 6.3 | |
| 15 | MailgunWeb | Two bars | — | 1 of 6 | Free | 6.2 | |
| 16 | Netcore Email APIWeb · API | Two bars | — | 1 of 6 | Free | 6.2 | |
| 17 | PomboWeb | One bar | — | 1 of 6 | $29/mo | 6.2 | |
| 18 | ReachMailWeb | Two bars | — | 1 of 6 | $8/mo | 6.2 | |
| 19 | PlunkWeb | One bar | — | 1 of 6 | Free | 6.1 | |
| 20 | MailmarkWeb · Self-hosted · API | One bar | — | — | 1 of 6 | $10/mo | 5.4 |
| 21 | Retarus Transactional EmailWeb · API | One bar | — | — | 1 of 6 | — | 5.4 |
| 22 | Aritic MailNo platforms listed | One bar | — | — | 0 of 6 | $9/mo | 5.2 |
| 23 | ClrStreamWeb | No signal | — | — | 1 of 6 | — | 5.2 |
| 24 | JangoMailWeb | No signal | — | — | 1 of 6 | — | 5.2 |
| 25 | MailsSetuWeb | No signal | — | — | 1 of 6 | — | 5.2 |
Compare all 25 in a table
| # | App | Score | Free plan | From | Free plan | Paid from | Delivery methods | Template options |
|---|---|---|---|---|---|---|---|---|
| 1 | turboSMTP | 6.6 | Free plan | €14.95/mo | No | — | — | — |
| 2 | Mailchimp | 6.5 | Free plan | Free | Yes | — | — | — |
| 3 | Twilio Segment | 6.5 | Free plan | $120/mo | No | 19.95 /mo | — | — |
| 4 | Maileroo | 6.4 | Free plan | $10/mo | Yes | 10 /mo | — | — |
| 5 | MailerSend | 6.4 | Free plan | $5.60/mo | Yes | 7 /mo | — | — |
| 6 | Nuntly | 6.4 | Free plan | €10/mo | Yes | — | both | both |
| 7 | Postmark | 6.4 | Free plan | $5/mo | Yes | 15 /mo | — | — |
| 8 | Resend Broadcasts | 6.4 | Free plan | $20/mo | Yes | — | — | — |
| 9 | SMTP2GO | 6.4 | Free plan | $8.33/mo | Yes | 10 /mo | — | — |
| 10 | EmailSuccess | 6.3 | Free plan | Free | Yes | — | both | — |
| 11 | Hyvor Relay | 6.3 | Free plan | — | Yes | — | — | — |
| 12 | Posthawk | 6.3 | Free plan | $20/mo | Yes | 20 /mo | both | both |
| 13 | Reloop | 6.3 | Free plan | $10/mo | Yes | 10 /mo | both | both |
| 14 | Twilio SendGrid | 6.3 | Free plan | $19.95/mo | No | 19.95 /mo | api | both |
| 15 | Mailgun | 6.2 | Free plan | Free | Yes | — | — | — |
| 16 | Netcore Email API | 6.2 | Free plan | Free | Yes | — | both | both |
| 17 | Pombo | 6.2 | Free plan | $29/mo | Yes | 29 /mo | — | — |
| 18 | ReachMail | 6.2 | Free plan | $8/mo | Yes | 8 /mo | — | — |
| 19 | Plunk | 6.1 | Free plan | Free | Yes | — | — | — |
| 20 | Mailmark | 5.4 | No | $10/mo | Yes | 10 /mo | api | code |
| 21 | Retarus Transactional Email | 5.4 | No | — | — | — | both | — |
| 22 | Aritic Mail | 5.2 | No | $9/mo | — | — | both | both |
| 23 | ClrStream | 5.2 | No | — | — | — | both | — |
| 24 | JangoMail | 5.2 | No | — | — | — | — | — |
| 25 | MailsSetu | 5.2 | No | — | Yes | — | both | both |
Is your app on this list?
Numbered spots on this list can be sponsored, and a sponsored row is labelled as paid.
Questions about this list
Which transactional email software is ranked first on Freedom251?
turboSMTP is ranked #1 of 41 with a score of 6.6. Mailchimp is second and Twilio Segment third.
How many of these have a free plan?
19 of the 25 on this page publish a free plan on their own pricing pages.
Which is the cheapest paid option?
On this page, Postmark has the lowest first paid tier we found: $5/mo.
How is this list ranked?
Ranked free-and-open first: a usable free tier and open-source code, then the platforms it runs on and its documentation.