Module handler 

Delivery backend abstraction for incoming email messages.

Every destination that can receive an email - filesystem storage, a Redis queue, etc. - implements the MessageHandler trait defined here. The trait is object-safe so that the router can dispatch dynamically.

Enums

HandlerError

Errors that can occur during message handling.

Traits

MessageHandler

Trait for message handlers that process incoming emails.

Type Aliases

HandlerFuture

Boxed future type for handler operations, enabling object safety.

HandlerResult

Result type for handler operations.