Listen on multiple ports for smtp?

Traditionally, we've provided setup smtp to listen on an additional port to 25 for travellers who find themselves on an ISP which blocks that port. We used a line in master.cf like:
<newportnumber> inet n - y - - smtpdproxywrite unix - - n - 1 proxymap
This seems to make snow leopard's postfix unhappy. It also doesn't work. I'd be grateful if anybody could tell me:
* what is or where to look for info on setting up postfix to do multiple ports? I've tried Apple docs and found nothing and only old-style in postfix docs -- though I could be missing something obvious as always.
* is this the modern and preferred way to get around the blocked port 25 problem or is it better to do some fancy-schmancy port redirection eg at the firewall to map multiple ports on to port 25 for postfix?
thanks and allbests,

In the past I've used the following with great success. Add the following line to /etc/postfix/master.cf file:
2525 inet n - n - - smtpd
Stop and start the mail service. Then test with telnet to ensure that the port is responding. Sadly, this still appears to be the best way, sans the use of a VPN, to get around ISP blocking.
Obviously port 25 needs to be open to receive mail. But instead of opening additional port in the firewall, you could drive all users to VPN.
I just tested the above line in 10.6.1 and it is responding.
Hope this helps

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Using a different port for SMTP

Where can I change my preference of port number for SMTP? I would like to use 366 since I think my ISP is blocking port 25.

Your ISP blocks inbound and/or outbound 25?
Port 25 is used for server-server communication and can't be changed.
If your ISP blocks port 25 inbound, then your server can't receive mail from other servers, even if you change it's port.
If your ISP blocks 25 outbound, you still need to send to a destination port 25. For outbound, the only thing you can do is relay through your ISP (either from client, or configure postfix to relay through ISP).
When people add alternate ports for SMTP, it's for the mail client to submit mail to the server. From there, server-server is always going to have a dest port of 25.
If you wish to add an alternate port (you said you wanted 366) for mail submission, edit /etc/postfix/master.cf
Find this line:
smtp inet n - n - - smtpd
add another below it (location doesn't really matter) like this:
366 inet n - n - - smtpd
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Here is my issue: I have data coming from two ports (TCP/IP) an array of 210 bytes and I'm not sure which port will be activated first. The data is asyncronus. So basically I want to figure out how to listen to the ports. I have this code...
import java.io.*;
import java.util.*;
import java.net.*;
public class SocketListener{
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        ServerSocket mySocket2 = null;
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}I'm not sure if it works or not... but thats what I got. Is this the best way to go about this or is there something else that I should look up in documentation / look for examples / someone might have a link to something.
Thanks a lot!!!!
Edited by: KTLightning on Sep 12, 2007 1:25 PM

There are two issues at hand here, one being networking and the second being threading. Threading is an extensive subject and I don't want to shortchange you here, so you may want to read this tutorial if you are not familiar with Java threading concepts: http://java.sun.com/docs/books/tutorial/essential/concurrency/index.html
That being said, if you want to concurrently listen to the sockets, you will need a thread for each socket you are listening. Otherwise you can use Java NIO, but unless you are going to be listening to many sockets at once, this complication is not necessary since the learning curve of Java NIO can be quite steep.
You might want to start out creating a new class that will handle the task of listening to a socket and retrieving the data in its own thread. You can do this by either extending the Thread class or implementing the Runnable interface. From your main class, you can then spawn as many of those objects as you need. The trick to this approach is knowing when the data has been read from the socket and stored in the object. For only two objects this is simple as you can have a hasData() method on your worker objects and then just put a loop in your main class checking to see if the condition has been met on the objects.
Here's some code fragments as an example...
public class SocketReader extends Thread ...
ServerSocket ss = null;
boolean hasData = false;
SocketReader(int port) {
ss = new ServerSocket(port);
public void run() {
ss.accept();
// do your stuff
hasData =true;
public boolean hasData() {
return hasData;
main() {
SocketReader sr1 = new SocketReader(12000);
SocketReader sr2 = new SocketReader(12000);
sr1.start();
sr2.start();
// keep looping until we have data in both
while (!sr1.hasData() && !sr2.hasData()) {
try {
Thread.sleep(100);
} catch (InterrruptedException ie) {/ do something}
} // end main
Keep in mind that this is a very simplistic example to demonstrate the concepts and would not be a good design for pretty much any other case.

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hello there,
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TS3899 what is the outgoing server port for smtp

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Netbeans 6.1 SMS NON-Brute force ability listen to multiple ports

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Klaus Pittig <[email protected]> wrote in message news:[email protected]..
I'd like to run weblogic with its http subsysten listen to port 80.
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