How to get default SMTP server name

You can find STMP server configured in hostname, in ask to dns of domain who is mailserver, you need to find MX records :

- look a DNS config : NS (name server) , CNAME (Alias) , MX (mailexchange) etc...

import java.util.ArrayList;

import java.util.Hashtable;

import javax.naming.*;

import javax.naming.directory.*;

public class MXLookup

{

public static void main(String args[]) throws NamingException

{

System.out.println(getMX("altern.org") + " mail servers");

}

private static ArrayList getMX(String hostName) throws NamingException

{

// Perform a DNS lookup for MX records in the domain

Hashtable env = new Hashtable();

env.put("java.naming.factory.initial", "com.sun.jndi.dns.DnsContextFactory");

DirContext ictx = new InitialDirContext(env);

Attributes attrs = ictx.getAttributes(hostName, new String[] { "MX" });

Attribute attr = attrs.get("MX");

// if we don't have an MX record, try the machine itself

if ((attr == null) || (attr.size() == 0))

{

attrs = ictx.getAttributes(hostName, new String[] { "A" });

attr = attrs.get("A");

if (attr == null) throw new NamingException("No match for name '" + hostName + "'");

}

ArrayList res = new ArrayList();

NamingEnumeration en = attr.getAll();

while (en.hasMore())

{

String x = (String) en.next();

String f[] = x.split(" ");

if (f[1].endsWith(".")) f[1] = f[1].substring(0, (f[1].length() - 1));

res.add(f[1]);

}

return res;

}

}

alterna at 2007-7-12 19:19:23 >