Module storage 

Storage engine traits and implementations for persisting email messages.

Provides StorageEngine as the abstract interface, with FileStorageEngine (filesystem-backed) and MemoryStorageEngine (in-memory, for testing) as concrete implementations.

Structs

FileStorageEngine

Filesystem-based storage engine.

MemoryStorageEngine

In-memory storage engine.

Enums

StorageError

Errors that can occur during storage operations.

Traits

StorageEngine

Trait for storage engines.

Type Aliases

StorageResult

Result type for storage operations.