Struct PolicyError 

pub struct PolicyError { /* private fields */ }

A crate::policy::SendPolicy rejected the send operation.

Unlike InvalidInputError (which enforces SMTP grammar constraints), PolicyError represents application-defined business-logic constraints: sender allowlists, recipient limits, message size caps, rate limits, etc.

The message field contains a human-readable explanation supplied by the policy implementation. It must not include credential or message-body data.

Implementations

impl PolicyError

pub fn new(message: impl Into<String>) -> Self

Construct from any Display-able message.

pub fn message(&self) -> &str

The human-readable rejection reason.

Trait Implementations

impl Debug for PolicyError

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

Formats the value using the given formatter.

impl Display for PolicyError

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

Formats the value using the given formatter.

impl Error for PolicyError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl From<PolicyError> for SmtpError

fn from(value: PolicyError) -> Self

Converts to this type from the input type.