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84 lines
4.9 KiB
Markdown
84 lines
4.9 KiB
Markdown
# Stalwart SMTP Server
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[](https://github.com/stalwartlabs/mail-server/actions/workflows/test.yml)
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[](https://github.com/stalwartlabs/smtp-server/actions/workflows/build.yml)
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[](https://www.gnu.org/licenses/agpl-3.0)
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[](https://discord.gg/jtgtCNj66U)
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[](https://twitter.com/stalwartlabs)
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**Stalwart SMTP** is a modern SMTP server developed in Rust with a focus on security, speed, and extensive configurability.
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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.
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Key features:
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- Sender and Message Authentication:
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- Domain-based Message Authentication, Reporting, and Conformance (**DMARC**) verification and failure/aggregate reporting.
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- DomainKeys Identified Mail (**DKIM**) verification, signing and failure reporting.
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- Sender Policy Framework (**SPF**) policy evaluation and failure reporting.
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- Authenticated Received Chain (**ARC**) verification and sealing.
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- Reverse IP (**iprev**) validation.
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- Strong Transport Security:
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- DNS-Based Authentication of Named Entities (**DANE**) Transport Layer Security.
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- SMTP MTA Strict Transport Security (**MTA-STS**).
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- SMTP TLS Reporting (**TLSRPT**) delivery and analysis.
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- Inbound Filtering and Throttling:
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- Sieve scripting language with support for all [registered extensions](https://www.iana.org/assignments/sieve-extensions/sieve-extensions.xhtml).
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- Filtering, modification and removal of MIME parts or headers.
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- DNS block lists (**DNSBL**) & Greylisting.
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- Inbound concurrency & rate limiting.
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- Integration with external content filtering systems such as SpamAssassin and ClamAV.
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- Flexible Queues:
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- Unlimited virtual queues with custom routing rules.
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- Delayed delivery with `FUTURERELEASE` and `DELIVERBY` extensions support.
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- Priority delivery with `MT-PRIORITY` extension support.
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- Outbound throttling & Disk quotas.
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- Logging and Reporting:
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- Detailed logging of SMTP transactions and events, including delivery attempts, errors, and policy violations.
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- Integration with **OpenTelemetry** to enable monitoring, tracing, and performance analysis of SMTP server operations.
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- Automatic analysis of incoming DMARC/TLS aggregate reports, DMARC/DKIM/SPF authentication failure reports as well as abuse reports.
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- And more:
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- SASL authentication.
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- LDAP, PostgreSQL, MySQL, MSSQL and SQLite support.
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- Granular configuration rules.
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- REST API for management.
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- Memory safe (thanks to Rust).
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## Get Started
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Install Stalwart SMTP Server on your server by following the instructions for your platform:
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- [Linux / MacOS](https://stalw.art/docs/install/linux)
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- [Windows](https://stalw.art/docs/install/windows)
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- [Docker](https://stalw.art/docs/install/docker)
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All documentation is available at [stalw.art/docs](https://stalw.art/docs/get-started).
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> **Note**
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> 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.
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## Support
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If you are having problems running Stalwart SMTP, you found a bug or just have a question,
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do not hesitate to reach us on [Github Discussions](https://github.com/stalwartlabs/smtp-server/discussions),
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[Reddit](https://www.reddit.com/r/stalwartlabs) or [Discord](https://discord.gg/gNCVEEkWyX).
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Additionally you may become a sponsor to obtain priority support from Stalwart Labs Ltd.
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## Funding
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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.
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If you find the project useful you can help by [becoming a sponsor](https://github.com/sponsors/stalwartlabs). Thank you!
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## License
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Licensed under the terms of the [GNU Affero General Public License](https://www.gnu.org/licenses/agpl-3.0.en.html) as published by
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the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
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See [LICENSE](LICENSE) for more details.
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You can be released from the requirements of the AGPLv3 license by purchasing
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a commercial license. Please contact licensing@stalw.art for more details.
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## Copyright
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Copyright (C) 2020-2023, Stalwart Labs Ltd.
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