Growth · alternatives · 2026

24 alternatives to Gmail Transactional Email Relay by GMass

A free service to send transactional emails through Gmail

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Gmail Transactional Email Relay by GMass launched in 2022; newer entries below may have overtaken it.

1. 1
   GMass▲580

   Send email marketing campaigns INSIDE Gmail.

   2017 · gmass.co · its alternatives →

2. 2
   Loops▲1,556

   Measure whether a campaign drove the desired outcome

   2023 · loops.so · its alternatives →

3. 3
   Unosend▲205

   Send transactional + marketing email w/ 99.9% deliverability

   Dec 2025 · unosend.co · its alternatives →

4. 4
   Mailmeteor▲567

   Send hundreds of personalized emails with Gmail.

   2019 · mailmeteor.com · its alternatives →

5. 5
   EmailBoards▲152

   Seamless ticket management for Gmail

   2024 · its alternatives →

6. 6
   FullContact for Gmail▲380

   Your Gmail Contacts. On steroids.

   2014 · fullcontact.com · its alternatives →

7. 7
   MailerSend▲305

   Better transactional emails for teams.

   2020 · its alternatives →

8. 8
   Mailtrack.io▲282

   The best email tracking solution I've found. Free

   2014 · mailsuite.com · its alternatives →

9. 9
   Shortwave▲299

   Email smarter & faster with a reinvented Gmail experience

   2022 · shortwave.com · its alternatives →

10. 10
    Mailmodo Email API▲244

    APIs to send automated interactive emails with forms

    2021 · mailmodo.com · its alternatives →

11. 11
    Pigeon Mail▲126

    Send hundreds of personalised emails from Gmail

    2021 · pigeonmail.co · its alternatives →

12. 12
    Mailmeteor 2.0▲290

    Send auto follow-up emails with Gmail

    2022 · mailmeteor.com · its alternatives →

13. 13
    Gmail for Slack by MailClark▲131

    The most complete Gmail app for Slack

    2018 · mailclark.ai · its alternatives →

14. 14
    Peakmails▲8

    Send unlimited transactional emails for free

    2024 · peakmails.com · its alternatives →

15. 15
    Gmail To Slack▲63

    Get new email notifications of specific senders in Slack

    2022 · nathrupjyoti.gumroad.com · its alternatives →

16. 16
    Neat Messages for Gmail▲121

    No more long and annoying lines of text in Gmail

    2018 · chromewebstore.google.com · its alternatives →

17. 17
    MailerSend - Transactional SMS API▲126

    Build strong customer connections with transactional SMS

    2022 · mailersend.com · its alternatives →

18. 18
    Spently▲92

    Turn your transactional emails into marketing opportunities.

    2016 · spently.com · its alternatives →

19. 19
    Mail Rocket▲141

    Create a mail merge with Gmail and Google Sheets

    2024 · mailrocket.io · its alternatives →

20. 20
    Gmail Mail Merge▲122

    Send personalized emails with attachments

    2017 · chromewebstore.google.com · its alternatives →

21. 21
    Drag Team▲153

    The simplest way to share emails as a team.

    2018 · dragapp.com · its alternatives →

22. 22
    MailSlurp▲103

    End-to-end email testing made easy

    2018 · mailslurp.com · its alternatives →

23. 23
    Takeout▲112

    Just another email service, but 10x better

    2022 · its alternatives →

24. 24
    Maileroo▲118

    Transactional email delivery

    2023 · maileroo.com · 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 →