//! 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};