Connect to SMTP Server in Java

connect-smtp-server-http.java

// Create an object of HttpProxy
HttpProxy proxy = new HttpProxy("18.222.124.59", 8080);

// Create SMTP client
try (SmtpClient client = new SmtpClient("host", 587, "username", "password")) {
  
    // Set proxy
    client.setProxy(proxy);
  
    // Send emails
    client.send(new MailMessage("sender@domain.com", "receiver@domain.com", "Sending Email via proxy",
            "Implement socks proxy protocol for versions 4, 4a, 5 (only Username/Password authentication)"));
}

connect-smtp-server-socks.java

// Create an object of SmtpClient
SmtpClient client = new SmtpClient("smtp.domain.com", "username", "password");

// Set security options
client.setSecurityOptions(SecurityOptions.SSLImplicit);

// Proxy settings
String proxyAddress = "192.168.203.142"; // proxy address
int proxyPort = 1080; // proxy port

// Create and set proxy
SocksProxy proxy = new SocksProxy(proxyAddress, proxyPort, SocksVersion.SocksV5);
client.setProxy(proxy);

// Send email
client.send(new MailMessage("sender@domain.com", "receiver@domain.com", "Sending Email via proxy",
        "Implement socks proxy protocol for versions 4, 4a, 5 (only Username/Password authentication)"));

connect-smtp-server.java

// Create an object of SmtpClient
SmtpClient client = new SmtpClient("smtp.gmail.com");

// Set username, password, port, and security options
client.setUsername("your.email@gmail.com");
client.setPassword("your.password");
client.setPort(587);
client.setSecurityOptions(SecurityOptions.SSLExplicit);

// Send emails
client.send(new MailMessage("sender@domain.com", "receiver@domain.com", "Sending Email via proxy", "Test email"));