Module types 

Filter rule types: conditions, operators, actions, and the composite rule structure. These types are domain-only (no storage/async dependencies) so they can be evaluated synchronously against any Filterable message.

Structs

Condition

A single condition clause.

FieldValues

Extracted field values from a message for condition evaluation.

FilterRule

A complete filter rule: conditions + actions + metadata.

MailEnvelope

A simple envelope of the fields a filter engine needs.

Notify

Configuration for the notify action (RFC 5436).

Vacation

Configuration for the vacation action (RFC 5230).

Enums

Action

An action to perform when a rule matches.

AddressPart

Which portion of an address an envelope test compares (RFC 5228 §5.1 :all / :localpart / :domain).

ConditionField

Message fields that conditions can target.

EnvelopePart

Which SMTP envelope value an envelope test reads (RFC 5228 §5.1 string-list "from" / "to").

Flag

An IMAP message flag.

LogicOp

Boolean combinator for conditions.

Operator

Comparison operators.

Constants

KNOWN_NOTIFY_SCHEMES

URI schemes recognized as notification methods during evaluation. mailto is defined by RFC 5436; the others are common extension schemes. Unknown schemes still parse — evaluation just warns.

Traits

Filterable

The fields a filter engine needs from a message.