mirror of
https://github.com/stalwartlabs/smtp-server.git
synced 2024-10-23 06:57:29 +00:00
95 lines
5.6 KiB
Markdown
95 lines
5.6 KiB
Markdown
# Stalwart SMTP Server
|
|
|
|
[](https://github.com/stalwartlabs/smtp-server/actions/workflows/build.yml)
|
|
[](https://www.gnu.org/licenses/agpl-3.0)
|
|
[](https://discord.gg/jtgtCNj66U)
|
|
[](https://twitter.com/stalwartlabs)
|
|
[](https://mastodon.social/@stalwartlabs)
|
|
|
|
**Stalwart SMTP** is a modern SMTP server developed in Rust with a focus on security, speed, and extensive configurability.
|
|
It features built-in DMARC, DKIM, SPF and ARC support for message authentication, strong transport security through DANE, MTA-STS and SMTP TLS reporting, and offers great flexibility and customization thanks to its dynamic configuration rules and native support for Sieve scripts.
|
|
|
|
Key features:
|
|
|
|
- Sender and Message Authentication:
|
|
- Domain-based Message Authentication, Reporting, and Conformance (**DMARC**) verification and failure/aggregate reporting.
|
|
- DomainKeys Identified Mail (**DKIM**) verification, signing and failure reporting.
|
|
- Sender Policy Framework (**SPF**) policy evaluation and failure reporting.
|
|
- Authenticated Received Chain (**ARC**) verification and sealing.
|
|
- Reverse IP (**iprev**) validation.
|
|
- Strong Transport Security:
|
|
- DNS-Based Authentication of Named Entities (**DANE**) Transport Layer Security.
|
|
- SMTP MTA Strict Transport Security (**MTA-STS**).
|
|
- SMTP TLS Reporting (**TLSRPT**) delivery and analysis.
|
|
- Inbound Filtering and Throttling:
|
|
- Sieve scripting language with support for all [registered extensions](https://www.iana.org/assignments/sieve-extensions/sieve-extensions.xhtml).
|
|
- **Milter** support for integration with external content filtering systems such as SpamAssassin and ClamAV.
|
|
- Address rewriting.
|
|
- Filtering, modification and removal of message parts or headers.
|
|
- Inbound concurrency & rate limiting.
|
|
- **Spam and Phishing** filter:
|
|
- Comprehensive set of filtering **rules** on par with popular solutions.
|
|
- Statistical **spam classifier** with automatic training capabilities.
|
|
- DNS Blocklists (**DNSBLs**) checking of IP addresses, domains, and hashes.
|
|
- Collaborative digest-based spam filtering with **Pyzor**.
|
|
- **Phishing** protection against homographic URL attacks, sender spoofing and other techniques.
|
|
- Trusted **reply** tracking to recognize and prioritize genuine e-mail replies.
|
|
- Sender **reputation** monitoring by IP address, ASN, domain and email address.
|
|
- **Greylisting** to temporarily defer unknown senders.
|
|
- **Spam traps** to set up decoy email addresses that catch and analyze spam.
|
|
- Flexible Queues:
|
|
- Unlimited virtual queues with custom routing rules.
|
|
- Delayed delivery with `FUTURERELEASE` and `DELIVERBY` extensions support.
|
|
- Priority delivery with `MT-PRIORITY` extension support.
|
|
- Outbound throttling & Disk quotas.
|
|
- Logging and Reporting:
|
|
- Detailed logging of SMTP transactions and events, including delivery attempts, errors, and policy violations.
|
|
- Integration with **OpenTelemetry** to enable monitoring, tracing, and performance analysis of SMTP server operations.
|
|
- Automatic analysis of incoming DMARC/TLS aggregate reports, DMARC/DKIM/SPF authentication failure reports as well as abuse reports.
|
|
- And more:
|
|
- SASL authentication.
|
|
- LDAP, PostgreSQL, MySQL, MSSQL and SQLite support.
|
|
- Email aliases, mailing lists, subaddressing and catch-all addresses support.
|
|
- Granular configuration rules.
|
|
- REST API for management.
|
|
- Memory safe (thanks to Rust).
|
|
|
|
## Get Started
|
|
|
|
Install Stalwart SMTP Server on your server by following the instructions for your platform:
|
|
|
|
- [Linux / MacOS](https://stalw.art/docs/install/linux)
|
|
- [Windows](https://stalw.art/docs/install/windows)
|
|
- [Docker](https://stalw.art/docs/install/docker)
|
|
|
|
All documentation is available at [stalw.art/docs/get-started](https://stalw.art/docs/get-started).
|
|
|
|
> **Note**
|
|
> If you need a more comprehensive solution that includes IMAP and JMAP servers, you should consider installing the [Stalwart Mail Server](https://github.com/stalwartlabs/mail-server) instead.
|
|
|
|
## Support
|
|
|
|
If you are having problems running Stalwart SMTP, you found a bug or just have a question,
|
|
do not hesitate to reach us on [Github Discussions](https://github.com/stalwartlabs/smtp-server/discussions),
|
|
[Reddit](https://www.reddit.com/r/stalwartlabs) or [Discord](https://discord.gg/gNCVEEkWyX).
|
|
Additionally you may become a sponsor to obtain priority support from Stalwart Labs Ltd.
|
|
|
|
## Funding
|
|
|
|
Part of the development of this project was funded through the [NGI0 Entrust Fund](https://nlnet.nl/entrust), a fund established by [NLnet](https://nlnet.nl/) with financial support from the European Commission's [Next Generation Internet](https://ngi.eu/) programme, under the aegis of DG Communications Networks, Content and Technology under grant agreement No 101069594.
|
|
|
|
If you find the project useful you can help by [becoming a sponsor](https://github.com/sponsors/stalwartlabs). Thank you!
|
|
|
|
## License
|
|
|
|
Licensed under the terms of the [GNU Affero General Public License](https://www.gnu.org/licenses/agpl-3.0.en.html) as published by
|
|
the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
|
|
See [LICENSE](LICENSE) for more details.
|
|
|
|
You can be released from the requirements of the AGPLv3 license by purchasing
|
|
a commercial license. Please contact licensing@stalw.art for more details.
|
|
|
|
## Copyright
|
|
|
|
Copyright (C) 2020-2023, Stalwart Labs Ltd.
|