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// Copyright 2025 Google LLC
// SPDX-License-Identifier: Apache-2.0
// 不好
/// Returns a future that resolves when operation completes.  
fn sync_to_server() -> Future<Bool>;

// 好
/// Sends local edits to the server, overwriting concurrent edits  
/// if any happened.  
fn sync_to_server() -> Future<Bool>;

// 不好
/// Returns an error if sending the email fails.  
fn send(&self, email: Email) -> Result<(), Error>;

// 好
/// Queues the email for background delivery and returns immediately.  
///
/// Returns an error immediately if the email is malformed.  
fn send(&self, email: Email) -> Result<(), Error>;