No. 11 of 22 ·Email Parsing Software

Stalwart mail-parser

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Freedom report

Two barsScore 6.2

Free tierA free tier is on its own pricing page
Open codeNo open-source code on record
Runs widely0 of 6 device platforms
DocumentedPlans, terms and facts published

Stalwart mail-parser is ranked #11 of 22 in email parsing software on Freedom251. There is a free plan.

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Open-source library Free Rust email parsing library · MIT or Apache-2.0 license github.com · 4 Oct 2026

Compared on email parsing software

Attachment parsing: Yes

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The record

What it does: mail-parser is an email parsing library written in Rust that supports Internet Message Format (RFC 5322), MIME (RFC 2045–2049), and other internet messaging RFCs.
Robust parsing: The library aims to parse non-conformant email messages when they do not deviate too far from the standard.
Message content: It provides a MIME tree and lists of text bodies, HTML bodies, and attachments; it can convert HTML to plain text and plain text to HTML when an alternative is absent.
Performance design: It uses SIMD kernels on supported targets and defers transfer decoding and charset conversion until content is read.
Memory use: The README says practically all strings returned by the library reference the raw input message.
Charsets: The library recognizes WHATWG encoding labels, and its optional full_encoding feature adds support for legacy multibyte character sets including Shift_JIS, Big5, and GB18030.
Parser limits: Defaults include a nesting depth of 64, up to 10,000 MIME parts, and up to 3 levels of decoded nested messages.
Security testing: The project says every library function has been fuzzed and tested with MIRI.
Production use: The README says mail-parser is used in production environments worldwide by Stalwart Mail Server.
Not a message builder: The library does not build email messages; the README points to the separate mail-builder crate for that functionality.
Optional features: No Cargo feature is enabled by default; the optional serde feature adds serialization support for Message and related types.
Rust requirement: The minimum supported Rust version is 1.98.
License: The library is available under either the MIT License or Apache License 2.0, at the user's option.
Price from: Free

Where it ranks on Freedom251

Best Email Parsing Software in 2026#11 of 22

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Sources

github.com/stalwartlabs/mail-parser· checked 4 Oct 2026