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Top 23 Python Email Projects
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Mail-in-a-Box
Mail-in-a-Box helps individuals take back control of their email by defining a one-click, easy-to-deploy SMTP+everything else server: a mail server in a box.
Project mention: Show HN: Posthorn, self-hosted mail without the mail server | news.ycombinator.com | 2026-05-26A VPS will not be cheaper - but you may get more for your money (more storage, unlimited accounts).
For something simple try https://mailinabox.email/
> would love to switch to some VPS/root or anything where I can SSH and install, compile my own services, but something where security is high and support is 24/7 available.
Those sound like expensive requirements to me. You want managed self hosted email? Some else providing support will be expensive.
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holehe
holehe allows you to check if the mail is used on different sites like twitter, instagram and will retrieve information on sites with the forgotten password function.
Project mention: Why Every AI+Security Tool I Tried Was Lying to Me (And What I Built Instead) | dev.to | 2026-05-18[+] Twitter: @targethandle [+] GitHub: https://github.com/megadose/holehe [+] IP Address: 80.249.165.118 [+] SSH Banner: SSH-2.0-OpenSSH_7.6p1 Ubuntu-4ubuntu0.3 [+] Organization: Unnamed Organization (United States)
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Project mention: Proton Mail Suspended Journalist Accounts at Request of Cybersecurity Agency | news.ycombinator.com | 2025-09-12
Not who you asked, but I self-host some non-critical mail domains using Mailu[0], which is a set of docker containers. It's been fairly low maintenance. Ease of setup depends on your technical knowledge, but if I can do it, and you're on HN asking the question, you'll probably manage.
[0]: https://mailu.io/
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Project mention: How to detect and block Mailinator emails (and 4,000+ disposable domains) | dev.to | 2026-05-20
martenson/disposable-email-domains — similar coverage, also community-maintained Drop the list into your signup handler and reject any domain in it:
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h8mail
Email OSINT & Password breach hunting tool, locally or using premium services. Supports chasing down related email
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django-anymail
Django email backends and webhooks for Amazon SES, Brevo, MailerSend, Mailgun, Mailjet, Mailtrap, Postmark, Postal, Resend, Scaleway TEM, SendGrid, SparkPost, Unisender Go and more
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Mailgun A powerful engine for teams that need deep tracking and complex routing. Free Tier: 100 emails/day.
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email-oauth2-proxy
An IMAP/POP/SMTP proxy that transparently adds OAuth 2.0 authentication for email clients that don't support this method. Keep legacy email clients working with Exchange Online, Gmail and other providers.
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NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
Python Email discussion
Python Email related posts
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How to detect and block Mailinator emails (and 4,000+ disposable domains)
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Serving a Website on a Raspberry Pi Zero Running in RAM
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How to Self-Host Your Own Email Server (And Stop Depending on Third Parties)
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Transactional Email APIs with Great Free Tiers
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Incremental Backups of Gmail Takeouts
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Ask HN: Running your own email service?
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Show HN: Mephisto – A RAM-only, ad-free disposable email PWA built with React
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A note from our sponsor - SaaSHub
www.saashub.com | 21 Jun 2026
Index
What are some of the best open-source Email projects in Python? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | Mail-in-a-Box | 15,341 |
| 2 | holehe | 11,177 |
| 3 | frappe | 10,273 |
| 4 | Mailpile | 8,844 |
| 5 | Mailu | 7,320 |
| 6 | SimpleLogin | 6,739 |
| 7 | disposable-email-domains | 5,161 |
| 8 | h8mail | 4,982 |
| 9 | inbox | 3,506 |
| 10 | modoboa | 3,502 |
| 11 | yagmail | 2,725 |
| 12 | python-o365 | 1,912 |
| 13 | django-anymail | 1,887 |
| 14 | socialscan | 1,782 |
| 15 | Beast_Bomber | 1,755 |
| 16 | flanker | 1,650 |
| 17 | sendgrid-python | 1,628 |
| 18 | mailrise | 1,549 |
| 19 | inbox.py | 1,501 |
| 20 | email-oauth2-proxy | 1,434 |
| 21 | python-email-validator | 1,410 |
| 22 | disposable | 1,371 |
| 23 | ThePhish | 1,334 |
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