public class MailboxReader
{
    private Store store;
    private Folder inbox;
    public MailboxReader(EmailAcc emailAcc)
    {
        // connect to pop3 inbox
        try {
            Properties properties = System.getProperties();
            Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider());
            properties.setProperty("mail.pop3.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
            properties.setProperty("mail.pop3.socketFactory.fallback", "false");
            properties.setProperty("mail.pop3.port", String.valueOf(emailAcc.pop3port));
            properties.setProperty("mail.pop3.socketFactory.port", String.valueOf(emailAcc.pop3port));
            properties.setProperty("mail.pop3.ssl.trust", "*");
            Session session = Session.getInstance(properties);
            store = session.getStore("pop3");
            store.connect(emailAcc.pop3ip, emailAcc.pop3port, emailAcc.username, emailAcc.password);
            inbox = store.getFolder("INBOX");
            inbox.open(Folder.READ_ONLY);

        } catch(Exception e)
        {
            e.printStackTrace();
        }
    }

    public Message[] getMessages()
    {
        try {
            return inbox.getMessages();
        } catch (MessagingException e) {
            e.printStackTrace();
        }
        return null;
    }

    public void close()
    {
        try {
            inbox.close(true);
            store.close();
        } catch (MessagingException e) {
            e.printStackTrace();
        }
    }
}

    EmailAcc emailAcc = new EmailAcc();
    emailAcc.username = "USERNAME@bk.ru";
    emailAcc.password = "PASSWORD";
    emailAcc.pop3ip = "pop.mail.ru";
    emailAcc.pop3port = 955;
    emailAcc.ssl = true;

    MailboxReader mailbox = new MailboxReader(emailAcc);

javax.mail.MessagingException: Connect failed;
  nested exception is:
    java.net.ConnectException: Operation timed out (Connection timed out)
    at com.sun.mail.pop3.POP3Store.protocolConnect(POP3Store.java:209)
    at javax.mail.Service.connect(Service.java:295)
    at com.wcexpumper.MailboxReader.<init>(MailboxReader.java:26)
    at com.wcexpumper.WcexPumper.<init>(WcexPumper.java:39)
    at com.wcexpumper.AppLauncher.main(AppLauncher.java:7)
Caused by: java.net.ConnectException: Operation timed out (Connection timed out)
    at java.net.PlainSocketImpl.socketConnect(Native Method)
    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
    at java.net.Socket.connect(Socket.java:589)
    at sun.security.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:673)
    at sun.security.ssl.BaseSSLSocketImpl.connect(BaseSSLSocketImpl.java:173)
    at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:321)
    at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:211)
    at com.sun.mail.pop3.Protocol.<init>(Protocol.java:112)
    at com.sun.mail.pop3.POP3Store.getPort(POP3Store.java:260)
    at com.sun.mail.pop3.POP3Store.protocolConnect(POP3Store.java:205)
    ... 4 more