Stalwart
Secure and modern open source mail server
About Stalwart
Stalwart is an all-in-one open-source mail server written in Rust. Supports SMTP, IMAP, JMAP, and ManageSieve — with DMARC, DKIM, SPF, and ARC. Designed for speed, security, and modern standards. Replace your aging Postfix/Dovecot stack.
Pitch deck breakdown
How Stalwart would pitch themselves.
Target customer
Developers + open-source communities + enterprises wanting an OSS-first tool in this category, with optional commercial support.
Problem they solve
Stalwart is an all-in-one open-source mail server written in Rust. Supports SMTP, IMAP, JMAP, and ManageSieve — with DMARC, DKIM, SPF, and ARC. Designed for speed, security, and modern standards. Replace your aging Post… The category has historically been served by tools that miss the modern workflow this product is built around.
Key differentiator
Stalwart differentiates on secure and modern open source mail server — and on being bootstrapped. The team prioritises profitability + customer-led growth over VC-fuelled scale. Founded by Mauro De Gennaro.
Go-to-market strategy
Bootstrapped go-to-market — content-led growth, founder-community presence, and product-led adoption via free or freemium tiers. Profitability + customer-funded expansion over VC capital efficiency.
Stalwart website preview
Company facts
- Category
- Open Source
- Funding stage
- Bootstrapped
- Total raised
- Open Source
- Founded
- 2022
- Team size
- 1-10
- HQ
- Remote
- Country
- USA
- Website
- stalw.art
Founders of Stalwart
- Mauro De Gennaro
Frequently asked questions
What does Stalwart do?
Stalwart is an all-in-one open-source mail server written in Rust. Supports SMTP, IMAP, JMAP, and ManageSieve — with DMARC, DKIM, SPF, and ARC. Designed for speed, security, and modern standards. Replace your aging Postfix/Dovecot stack.
Where is Stalwart based?
Stalwart is based in Remote, USA.
When was Stalwart founded?
Stalwart was founded in 2022.
How much has Stalwart raised?
Stalwart has raised Open Source in their Bootstrapped round.
Who founded Stalwart?
Stalwart was founded by Mauro De Gennaro.