Growth · alternatives · 2026

24 alternatives to SMTPKit

Powerful SMTP & API for Transactional Emails

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. SMTPKit launched in 2024; newer entries below may have overtaken it.

1. 1
   Unosend▲205

   Send transactional + marketing email w/ 99.9% deliverability

   Dec 2025 · unosend.co · its alternatives →

2. 2
   SelfMailKit▲13

   Send transactional & marketing emails

   2025 · its alternatives →

3. 3
   Loops▲1,556

   Email made easy

   2023 · loops.so · its alternatives →

4. 4
   MailerSend▲314

   Better transactional emails for teams.

   2020 · its alternatives →

5. 5
   Resend▲1,325

   Email for developers

   2023 · resend.com · its alternatives →

6. 6
   Sendkit▲25

   The AI-Native Email Infrastructure

   Apr 2026 · sendkit.dev · its alternatives →

7. 7
   Mailercloud Email API Platform▲165

   1,000+ Emails per Second with 99%+ Deliverability

   Mar 2026 · mailercloud.com · its alternatives →

8. 8
   Mailmodo Email API▲244

   APIs to send automated interactive emails with forms

   2021 · its alternatives →

9. 9
   Sidemail.io▲204

   Email delivery made simple for startups

   2020 · its alternatives →

10. 10
    Sender▲297

    Super easy and affordable email marketing platform

    2021 · its alternatives →

11. 11
    Tipimail by Sarbacane▲65

    SMTP server & email API embed in an intuitive interface

    2020 · its alternatives →

12. 12
    MailerLogic▲96

    Email API with built-in deliverability intelligence

    Apr 2026 · mailerlogic.com · its alternatives →

13. 13
    Gmail Transactional Email Relay by GMass▲79

    A free service to send transactional emails through Gmail

    2022 · its alternatives →

14. 14
    Keplars▲116

    Email Infrastructure for Modern Product Teams

    Apr 2026 · keplars.com · its alternatives →

15. 15
    MailerSend - Transactional SMS API▲126

    Build strong customer connections with transactional SMS

    2022 · its alternatives →

16. 16
    AutoSend▲365

    Email for Developers, Marketers, and AI Agents

    Jan 2026 · autosend.com · its alternatives →

17. 17
    Sidemail 2.0▲307

    All-in-one email platform for SaaS

    Nov 2025 · sidemail.io · its alternatives →

18. 18
    Sendster AI▲96

    AI enabled newsletter software for Amazon SES, SMTPs

    2023 · its alternatives →

19. 19
    Mailazy▲203

    Cloud email infrastructure for the internet

    2022 · its alternatives →

20. 20
    Thanks.io▲146

    Direct mail automation platform

    2023 · its alternatives →

21. 21
    Flowmailer▲63

    The email delivery platform you can rely on

    2020 · its alternatives →

22. 22
    UniqMail▲86

    Revolutionize emailing with AI customization with Free App

    2024 · its alternatives →

23. 23
    MessageBus▲69

    Send email with a powerful API, track it with our platform.

    2014 · its alternatives →

24. 24
    Codemail.io▲88

    Send emails with perfectly formatted code snippets

    2025 · codemail.io · its alternatives →

Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →