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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
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 |
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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 |