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Asked: 2026-05-25T19:21:02+00:00

I’m using JavaMail and I want it to work through proxy for every threads

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I’m using JavaMail and I want it to work through proxy for every threads (I have multithreading application). I’m using SMTPTransport.connect(Socket socket) for this.

Here is socket initialization:

socket = new Socket();
socket.setSoTimeout(10000);
socket.connect(new InetSocketAddress(smtpHost, smtpPort));

Here is SMTPTransport call:

SMTPTransport transport = null;
try
    {
     transport = (SMTPTransport) mail.getTransport("smtp");
     transport.connect(socket);
     System.out.println("ok");

And so on. But I this error happens:

DEBUG: JavaMail version 1.4.4 DEBUG: successfully loaded resource:
/META-INF/javamail.default.providers DEBUG: Tables of loaded providers
DEBUG: Providers Listed By Class Name:
{com.sun.mail.smtp.SMTPSSLTransport=javax.mail.Provider[TRANSPORT,smtps,com.sun.mail.smtp.SMTPSSLTransport,Sun
Microsystems, Inc],
com.sun.mail.smtp.SMTPTransport=javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Sun
Microsystems, Inc],
com.sun.mail.imap.IMAPSSLStore=javax.mail.Provider[STORE,imaps,com.sun.mail.imap.IMAPSSLStore,Sun
Microsystems, Inc],
com.sun.mail.pop3.POP3SSLStore=javax.mail.Provider[STORE,pop3s,com.sun.mail.pop3.POP3SSLStore,Sun
Microsystems, Inc],
com.sun.mail.imap.IMAPStore=javax.mail.Provider[STORE,imap,com.sun.mail.imap.IMAPStore,Sun
Microsystems, Inc],
com.sun.mail.pop3.POP3Store=javax.mail.Provider[STORE,pop3,com.sun.mail.pop3.POP3Store,Sun
Microsystems, Inc]} DEBUG: Providers Listed By Protocol:
{imaps=javax.mail.Provider[STORE,imaps,com.sun.mail.imap.IMAPSSLStore,Sun
Microsystems, Inc],
imap=javax.mail.Provider[STORE,imap,com.sun.mail.imap.IMAPStore,Sun
Microsystems, Inc],
smtps=javax.mail.Provider[TRANSPORT,smtps,com.sun.mail.smtp.SMTPSSLTransport,Sun
Microsystems, Inc],
pop3=javax.mail.Provider[STORE,pop3,com.sun.mail.pop3.POP3Store,Sun
Microsystems, Inc],
pop3s=javax.mail.Provider[STORE,pop3s,com.sun.mail.pop3.POP3SSLStore,Sun
Microsystems, Inc],
smtp=javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Sun
Microsystems, Inc]} DEBUG: successfully loaded resource:
/META-INF/javamail.default.address.map DEBUG: getProvider() returning
javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Sun
Microsystems, Inc] DEBUG SMTP: useEhlo true, useAuth true DEBUG SMTP:
useEhlo true, useAuth true DEBUG SMTP: starting protocol to host
“smtp.googlemail.com”, port 465 DEBUG SMTP: exception reading
response: java.net.SocketTimeoutException: Read timed out Exception
reading response javax.mail.MessagingException: Exception reading
response; nested exception is: java.net.SocketTimeoutException:
Read timed out at
com.sun.mail.smtp.SMTPTransport.readServerResponse(SMTPTransport.java:2153)
at
com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1956)
at
com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:636)
at javax.mail.Service.connect(Service.java:317) at
javax.mail.Service.connect(Service.java:176) at
javax.mail.Service.connect(Service.java:125) at
com.sun.mail.smtp.SMTPTransport.connect(SMTPTransport.java:274) at
lsmtpc.CheckAccount.run(CheckAccount.java:203) at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166) at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722) Caused by:
java.net.SocketTimeoutException: Read timed out at
java.net.SocketInputStream.socketRead0(Native Method) at
java.net.SocketInputStream.read(SocketInputStream.java:150) at
java.net.SocketInputStream.read(SocketInputStream.java:121) at
com.sun.mail.util.TraceInputStream.read(TraceInputStream.java:110) at
java.io.BufferedInputStream.fill(BufferedInputStream.java:235) at
java.io.BufferedInputStream.read(BufferedInputStream.java:254) at
com.sun.mail.util.LineInputStream.readLine(LineInputStream.java:89)
at
com.sun.mail.smtp.SMTPTransport.readServerResponse(SMTPTransport.java:2131)
… 13 more

So as I see JavaMail can’t read from socket. So what am I doing wrong? If I try to use transport.connect() method without using Socket in constructor all works perfectly and smtpHost/smtpPort are accessible from the telnet and I have no any firewalls/antiviruses.

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1 Answer

  1. Editorial Team

    From the documentation for com.sun.mail.smtp.SMTPTransport:

    In general, applications should not need to use the classes in this
    package directly. Instead, they should use the APIs defined by
    javax.mail package (and subpackages). Applications should never
    construct instances of SMTPTransport directly. Instead, they should
    use the Session method getTransport to acquire an appropriate
    Transport object.

    WARNING: The APIs unique to this package should be considered
    EXPERIMENTAL. They may be changed in the future in ways that are
    incompatible with applications using the current APIs.

    JavaMail tutorial: http://java.sun.com/developer/onlineTraining/JavaMail/contents.html

    Could be you are not passing authentication information. Could be you are connecting to a secured host using a plain socket. You might want to read the tutorial linked for the best way to use JavaMail.

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