Struct Message 

#[non_exhaustive]
pub struct Message { /* private fields */ }

Parsed message content and headers.

Validation

Message validation is split between this crate and the wire layer:

• Message::validate_basic enforces structural invariants: From is set, Sender is not set without From, at least one recipient in To/Cc/Bcc, the subject contains no raw \r, \n, or non-tab control characters, and no custom header collides with a structured field (Subject, Message-ID, …).
• Per-field RFC 5322 invariants (line length, RFC 2047 encoded-word wrapping, ASCII-after-encoding, header folding) are enforced by email_message_wire::render_rfc822 for SMTP paths.
• HTTP-API adapters (Postmark, Resend, Mailgun, Loops) bypass the wire renderer and rely on serde_json string-escaping for control-char neutralization in JSON bodies.

Adapters that bypass both the wire renderer and a JSON-encoded transport must validate header values themselves.

Implementations

impl Message

pub const fn new(from: Mailbox, to: Vec<Address>, body: Body) -> Self

Creates a message with required semantic fields.

pub const fn builder(body: Body) -> MessageBuilder

Returns a builder for incrementally constructing messages.

pub const fn from_mailbox(&self) -> Option<&Mailbox>

Returns the optional From mailbox, if one has been set.

OutboundMessage validation guarantees From is present; for already-validated messages, prefer OutboundMessage::from_mailbox which returns &Mailbox directly.

pub const fn sender(&self) -> Option<&Mailbox>

pub fn to(&self) -> &[Address]

pub fn cc(&self) -> &[Address]

pub fn bcc(&self) -> &[Address]

pub fn reply_to(&self) -> &[Address]

pub fn subject(&self) -> Option<&str>

pub const fn date(&self) -> Option<&OffsetDateTime>

pub const fn message_id(&self) -> Option<&MessageId>

pub fn headers(&self) -> &[Header]

pub const fn body(&self) -> &Body

pub fn attachments(&self) -> &[Attachment]

pub fn with_attachments<I>(self, attachments: I) -> Self

where I: IntoIterator<Item = Attachment>,

pub fn into_attachments(self) -> (Self, Vec<Attachment>)

Split the message into an attachment-free message and its attachments.

pub fn validate_basic(&self) -> Result<(), MessageValidationError>

Validates baseline message invariants.

Coverage

The gate covers top-level message fields (from, sender, recipients, subject, custom headers) and the attachments list (filename and content-id byte discipline). It does not recurse into Body::Mime payloads: MIME-tree fields the typed wrappers leave unvalidated at construction (notably MimePart::Multipart’s boundary: Option<String>, which is lazy-checked by the wire renderer’s validate_boundary at render time, and MimePart::Leaf’s raw body: Vec<u8>, which is transfer-encoded at render time) are not inspected here. Such bytes are caught by the wire renderer at email_message_wire::render_rfc822’s header-emission and boundary-validation stages, which reject raw CR/LF and non-ASCII at write time. Walking the entire MimePart tree in this method would make the gate quadratic on attacker-controlled depth, the inverse of the renderer’s own MAX_MULTIPART_DEPTH cap.

Errors

Returns MessageValidationError when required message fields are missing or inconsistent.

pub fn derive_envelope(&self) -> Result<Envelope, MessageValidationError>

Derives an SMTP envelope from message semantics.

Errors

Returns MessageValidationError when the message does not contain the fields needed to derive an envelope.

Trait Implementations

impl<'a> Arbitrary<'a> for Message

Available on crate feature arbitrary only.

fn arbitrary(u: &mut Unstructured<'a>) -> Result<Self>

Generate an arbitrary value of Self from the given unstructured data.

fn arbitrary_take_rest(u: Unstructured<'a>) -> Result<Self, Error>

Generate an arbitrary value of Self from the entirety of the given unstructured data.

fn size_hint(depth: usize) -> (usize, Option<usize>)

Get a size hint for how many bytes out of an Unstructured this type needs to construct itself.

fn try_size_hint( depth: usize, ) -> Result<(usize, Option<usize>), MaxRecursionReached>

Get a size hint for how many bytes out of an Unstructured this type needs to construct itself.

impl Clone for Message

fn clone(&self) -> Message

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Message

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Message

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl From<OutboundMessage> for Message

fn from(value: OutboundMessage) -> Self

Converts to this type from the input type.

impl JsonSchema for Message

fn schema_name() -> Cow<'static, str>

The name of the generated JSON Schema.

fn schema_id() -> Cow<'static, str>

Returns a string that uniquely identifies the schema produced by this type.

fn json_schema(generator: &mut SchemaGenerator) -> Schema

Generates a JSON Schema for this type.

fn inline_schema() -> bool

Whether JSON Schemas generated for this type should be included directly in parent schemas, rather than being re-used where possible using the $ref keyword.

impl PartialEq for Message

fn eq(&self, other: &Message) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for Message

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl TryFrom<Message> for OutboundMessage

type Error = MessageValidationError

The type returned in the event of a conversion error.

fn try_from(value: Message) -> Result<Self, Self::Error>

Performs the conversion.

impl Eq for Message

impl StructuralPartialEq for Message