BREAKING CHANGE(smtp-client): Replace the legacy TypeScript SMTP client with a new Rust-based SMTP client and IPC bridge for outbound delivery

rust/crates/mailer-smtp/src/client/mod.rs

@@ -0,0 +1,16 @@
+//! SMTP client module for outbound email delivery.
+//!
+//! Provides connection pooling, SMTP protocol, TLS, and authentication
+//! for sending outbound emails through remote SMTP servers.
+
+pub mod config;
+pub mod connection;
+pub mod error;
+pub mod pool;
+pub mod protocol;
+
+// Re-export key types for convenience.
+pub use config::{DkimSignConfig, SmtpAuthConfig, SmtpClientConfig};
+pub use error::SmtpClientError;
+pub use pool::{SmtpClientManager, SmtpSendResult, SmtpVerifyResult};
+pub use protocol::{dot_stuff, EhloCapabilities, SmtpClientResponse};