Rust

Explicitly Connect to the SMTP Server

Demonstrates the Chilkat MailMan.SmtpConnect method, which explicitly connects to the SMTP server. If SSL/TLS is required by the current property settings, the secure TLS channel is established as part of connecting. This example opens the connection.

Background: SmtpConnect performs just the connect (and TLS handshake) step, without authenticating — useful when you want fine-grained control over the connection lifecycle, or to separate connecting from authenticating (SmtpAuthenticate) for diagnostics. For everyday sending you don't need to call it: SendEmail connects automatically.

Chilkat Rust Downloads

Download Chilkat for Rust

Rust


// Demonstrates the MailMan.SmtpConnect method, which explicitly connects to the SMTP server.
// If SSL/TLS is required by the current property settings, the secure channel is established
// as part of connecting.

let mailman = chilkat::MailMan::new();

// Configure the SMTP server connection.
mailman.set_smtp_host("smtp.example.com");
mailman.set_smtp_port(465);
mailman.set_smtp_ssl(true);

// Explicitly connect to the SMTP server (does not authenticate).

if mailman.smtp_connect().is_err() {
    println!("{}", mailman.last_error_text());
    return;
}

println!("Connected to the SMTP server.");