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This repository was archived by the owner on Oct 8, 2024. It is now read-only.
**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 and sender authentication, strong transport security through DANE, MTA-STS, SMTP TLS reporting and offers great flexibility and customization thanks to its configurable rules and native support for Sieve scripts.
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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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@@ -24,17 +24,14 @@ Key features:
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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**).
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- Greylisting.
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- Inbound concurrency and rate limiting.
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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.
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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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- Quotas.
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- Outbound throttling.
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- Custom routing rules.
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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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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/jtgtCNj66U).
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[Reddit](https://www.reddit.com/r/stalwartlabs) or [Discord](https://discord.gg/9dXkHzCk).
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Additionally you may become a sponsor to obtain priority support from Stalwart Labs Ltd.
[mail-auth](https://github.com/stalwartlabs/mail-auth) and [sieve-rs](https://github.com/stalwartlabs/sieve).
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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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