Growth · alternatives · 2026

24 alternatives to SMTP Express

All-in-one email infrastructure for modern products & teams

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes.

1. 1
   Flowmailer▲63

   The email delivery platform you can rely on

   2020 · spotler.com · its alternatives →

2. 2
   Sidemail▲494

   Quick & easy email for all your side projects

   2018 · sidemail.com · its alternatives →

3. 3
   [Sending]flow▲191

   All-in-one Webflow email autoresponder

   2024 · sendingflow.app · its alternatives →

4. 4
   Sidemail 2.0▲306

   Hi all! I'm Kristyna, maker of Sidemail. I'd love to share with you what we've been building. We built Sidemail because sending emails from a SaaS app was way harder than it should be. Sidemail is made for developers and teams that want one simple place to handle SaaS emails with reliable delivery and no bloat. It has: - Everything for creating, managing and delivering SaaS emails in one platform, - Easy-to-use email API for sending password resets, receipts, etc. - Messenger for writing product updates and newsletters, - Email automations for onboarding and lifecycle flows, - Fast email…

   Nov 2025 · sidemail.io · its alternatives →

5. 5
   Superflows▲476

   AI assistant for email - get to inbox zero faster

   2023 · superflows.ai · its alternatives →

6. 6
   Email Architect▲220

   All-in-1 system to write, manage & organize email-marketing

   2022 · getemailarchitect.com · its alternatives →

7. 7
   Polymail Web▲437

   All-in-one email platform for sales communication

   2018 · polymail.io · its alternatives →

8. 8
   Inbox Flows▲159

   Research and compare emails from top brands & competitors

   2021 · inboxflows.com · its alternatives →

9. 9
   Loop Email▲257

   Emailing for teams: Organize your Inbox into channels 💌

   2018 · intheloop.io · its alternatives →

10. 10
    Mailflow▲267

    Run your business from Gmail

    2020 · getmailflow.com · its alternatives →

11. 11
    Courier▲141

    Your inbox emojified and summarized

    2017 · its alternatives →

12. 12
    ClientFlow▲129

    Enabling teams to manage shared conversations and tasks

    2016 · its alternatives →

13. 13
    Mailjet▲203

    Send marketing and transactional emails with one account

    2014 · mailjet.com · its alternatives →

14. 14
    iMailer▲115

    Email for busy professionals

    2022 · its alternatives →

15. 15
    A self-hosted email engine▲149

    Everything you need to start sending newsletters, drip campaigns, transactional emails. Mailcoach is a fully featured email marketing platform built for growing creators, developers, and businesses.

    2020 · mailcoach.app · its alternatives →

16. 16
    Hound▲114

    The fastest way to conduct competitive email research

    2025 · its alternatives →

17. 17
    Mailbutler for Outlook▲72

    Get more out of your Outlook inbox

    2020 · mailbutler.io · its alternatives →

18. 18
    Our Shared Inbox▲84

    Share & receive emails with your whole QA and dev team

    2023 · its alternatives →

19. 19
    SMTPedia▲55

    Email marketing Wiki

    2024 · smtpedia.com · its alternatives →

20. 20
    Mailor▲80

    Shared inbox, team portal and smart notifications

    2017 · mailor.us · its alternatives →

21. 21
    Unitpost▲26

    Email component library that works in Outlook, Gmail, and Apple Mail. MIT. Install with npm or a Skill. No account.

    Sep 2026 · unitpost.com · its alternatives →

22. 22
    Mailshouts▲78

    Customized insights over email

    2023 · its alternatives →

23. 23
    SupportYard▲87

    Organize emails and let your team respond from one inbox

    2015 · supportyard.com · its alternatives →

24. 24
    TraceMail▲100

    Know, don't guess when your emails are read

    2024 · 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 →