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Top 23 Rust Email Projects
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stalwart
All-in-one Mail & Collaboration server. Secure, scalable and fluent in every protocol (IMAP, JMAP, SMTP, CalDAV, CardDAV, WebDAV).
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InfluxDB
InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
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Project mention: Ask HN: Is there a dev friendly alternative to Gmail, Outlook, etc.? | news.ycombinator.com | 2025-03-07
https://github.com/pimalaya/himalaya has some, but not all, of your requirements
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check-if-email-exists
Check if an email address exists without sending any email, written in Rust. Comes with a ⚙️ HTTP backend.
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DataSurgeon
Quickly Extracts IP's, Email Addresses, Hashes, Files, Credit Cards, Social Security Numbers and a lot More From Text
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core
Chatmail Rust Core library, used by Android/iOS/desktop apps, bindings and bots 📧 (by chatmail)
Project mention: Delta Chat is a decentralized and secure messenger app | news.ycombinator.com | 2025-06-24For FOSS software, why not have a link to the Github repo or org prominently displayed in the title/menu bar?
It took me a couple of clicks to find: https://github.com/deltachat
The "Internet Standards" link points to a URL under https://github.com/deltachat/deltachat-core-rust/ but when you go there it actually redirects and you end up at https://github.com/chatmail/core which is also confusing.
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I build something to visualize huge amounts of email (such as from Gmail) some years ago:
https://github.com/terhechte/postsack
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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kumomta
The first Open-Source high-performance MTA developed from the ground-up for high-volume email sending environments.
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mail-autodiscover-autoconfig
A docker image to deploy to have a dynamic autodiscover XML and autoconfig XML host. Supports Outlook, Thunderbird, Apple, some Android apps, and more..
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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).
Rust Email discussion
Rust Email related posts
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Delta Chat is a decentralized and secure messenger app
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Calendars, Contacts and Files in Stalwart
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Ask HN: Is there a dev friendly alternative to Gmail, Outlook, etc.?
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Revolutionizing Email: Stalwart Mail Server - Secure, Modern, and Easy to Use
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Ten Years of JMAP
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Himalaya – a Rust CLI to manage emails
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Email Command Line Application
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A note from our sponsor - InfluxDB
www.influxdata.com | 24 Jun 2025
Index
What are some of the best open-source Email projects in Rust? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | stalwart | 8,760 |
| 2 | himalaya | 4,789 |
| 3 | check-if-email-exists | 4,549 |
| 4 | lettre | 2,045 |
| 5 | DataSurgeon | 833 |
| 6 | core | 747 |
| 7 | postsack | 551 |
| 8 | rust-imap | 522 |
| 9 | mail-parser | 374 |
| 10 | kumomta | 338 |
| 11 | neverest | 264 |
| 12 | mail-send | 241 |
| 13 | mailparse | 205 |
| 14 | sendgrid-rs | 111 |
| 15 | mail-auth | 102 |
| 16 | pigeon-rs | 79 |
| 17 | jmap-client | 78 |
| 18 | mail-builder | 65 |
| 19 | glit | 50 |
| 20 | mailfred | 31 |
| 21 | crabmail | 28 |
| 22 | sieve | 26 |
| 23 | mail-autodiscover-autoconfig | 25 |
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InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
www.influxdata.com