Class SMTPTransport

app/src/main/java/com/sun/mail/smtp/SMTPTransport.java:78–2918

This class implements the Transport abstract class using SMTP for message submission and transport. See the com.sun.mail.smtp package documentation for further information on the SMTP protocol provider. This class includes many protected methods that allo

 */

public class SMTPTransport extends Transport {

    private String name = "smtp";	// Name of this protocol
    private int defaultPort = 25;	// default SMTP port
    private boolean isSSL = false;	// use SSL?
    private String host;		// host we're connected to

    // Following fields valid only during the sendMessage method.
    private MimeMessage message;	// Message to be sent
    private Address[] addresses;	// Addresses to which to send the msg
    // Valid sent, valid unsent and invalid addresses
    private Address[] validSentAddr, validUnsentAddr, invalidAddr;
    // Did we send the message even though some addresses were invalid?
    private boolean sendPartiallyFailed = false;
    // If so, here's an exception we need to throw
    private MessagingException exception;
    // stream where message data is written
    private SMTPOutputStream dataStream;

    // Map of SMTP service extensions supported by server, if EHLO used.
    private Hashtable<String, String> extMap;

    private Map<String, Authenticator> authenticators
	    = new HashMap<>();
    private String defaultAuthenticationMechanisms;	// set in constructor

    private boolean quitWait = false;	// true if we should wait
    private boolean quitOnSessionReject = false;   // true if we should send quit when session initiation is rejected

    private String saslRealm = UNKNOWN;
    private String authorizationID = UNKNOWN;
    private boolean enableSASL = false;	// enable SASL authentication
    private boolean useCanonicalHostName = false; // use canonical host name?
    private String[] saslMechanisms = UNKNOWN_SA;

    private String ntlmDomain = UNKNOWN; // for ntlm authentication

    private boolean reportSuccess;	// throw an exception even on success
    private boolean useStartTLS;	// use STARTTLS command
    private boolean requireStartTLS;	// require STARTTLS command
    private boolean useRset;		// use RSET instead of NOOP
    private boolean noopStrict = true;	// NOOP must return 250 for success

    private MailLogger logger;		// debug logger
    private MailLogger traceLogger;	// protocol trace logger
    private String localHostName;	// our own host name
    private String lastServerResponse;	// last SMTP response
    private int lastReturnCode;		// last SMTP return code
    private boolean notificationDone;	// only notify once per send

    private SaslAuthenticator saslAuthenticator; // if SASL is being used

    private boolean noauthdebug = true;	// hide auth info in debug output
    private boolean debugusername;	// include username in debug output?
    private boolean debugpassword;	// include password in debug output?
    private boolean allowutf8;		// allow UTF-8 usernames and passwords?
    private int chunkSize;		// chunk size if CHUNKING supported