Alternatives

Products that do what Sunnybox – An Email API for Effortless IMAP Integration does

Hello HN, I'm Bijan, a software developer and the creator of Sunnybox (https://sunnybox.io). I developed Sunnybox to make email integrations more straightforward for developers, especially in terms of interacting with IMAP servers. Sunnybox is an Email API that offers: - Easy integration with IMAP accounts. - Webhooks for real-time email notifications. -JSON:API format responses (https://jsonapi.org) for better standardization. Built using Ruby on Rails, Sunnybox is designed to offer a powerful yet easy-to-use solution for developers managing email systems. I'd really…

1. 1
   Sunnybox.io▲145

   The ultimate API for handling email

   2023

2. 2
   HookBox▲120

   An Instant Webhook & Email Debugging tool for developers.

   Sep 2025

3. 3
   Context.IO▲226

   API for email inboxes

   2015

4. 4
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   Email sandbox for software developers

   2024

5. 5
   Banger Mail▲139

   Shared mailboxes for teams and AI agents

   Jul 2026 · bangermail.com

6. 6
   Avatar API▲85

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7. 7
   Mimestream▲224

   A native macOS email client for Gmail

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8. 8
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   Access any email account to receive/send emails with an API

   2021

9. 9NC
   nvlope.com, your mailbox with an API▲65

   2013 · nvlope.com

10. 10
    jsonbox.io▲200

    A free HTTP based JSON Storage.

    2019

11. 11
    Mailercloud Email API Platform▲165

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

    Mar 2026

12. 12
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    Flexible, RESTful access to the user's inbox

    2014

13. 13
    ZeroInbox.ai▲130

    AI email organizer

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14. 14
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    The ultimate search, analysis, and productivity companion

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15. 15
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16. 16
    ReplylessAI▲122

    AI Email app that's affordable, Hit Inbox Zero

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17. 17
    Codemail.io▲88

    Send emails with perfectly formatted code snippets

    2025

18. 18MS
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    2019 · github.com

19. 19
    Tempbox▲98

    Instant disposable email client for Mac

    2021

20. 20MS
    Maildown – super simple email API▲40

    2020 · maildown.dev

21. 21
    Maool Email Editor▲85

    Create engaging email designs without coding

    2022

22. 22SE
    Simple Email API▲15

    2021 · batsign.me

23. 23OS
    Open source mobile email client built with HTML/CSS/JS▲16

    Hey HN, I've been working on an email client and wanted to get some feedback! Minimail is built on Phonegap, so it uses HTML/CSS/JS for everything user-facing. The app also uses emailbox (a related project of mine) as the backend API for receiving/parsing/sending emails. I think email clients need a huge UX/UI overhaul, and so I'm trying to build a flexible/hackable email client that anyone can customize to fit their email workflow. Thanks for any feedback! Website: https://minimail.herokuapp.com/ Email: nick (at) getemailbox.com

    2013

24. 24ET
    Email Templating API▲38

    2014 · sendwithus.com

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