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SubEtha SMTP is an easy-to-use server-side SMTP library for Java.

There is a newer version: 3.1.7

package org.subethamail.smtp.test.util;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;

/**
 * A crude telnet client that can be used to send SMTP messages and test
 * the responses.
 *
 * @author Jeff Schnitzer
 * @author Jon Stevens
 */
public class Client
{
	Socket socket;
	BufferedReader reader;
	PrintWriter writer;

	/**
	 * Establishes a connection to host and port.
	 * @throws IOException
	 * @throws UnknownHostException
	 */
	public Client(String host, int port) throws UnknownHostException, IOException
	{
		this.socket = new Socket(host, port);
		this.writer = new PrintWriter(this.socket.getOutputStream(), true);
		this.reader = new BufferedReader(new InputStreamReader(this.socket.getInputStream()));
	}

	/**
	 * Sends a message to the server, ie "HELO foo.example.com". A newline will
	 * be appended to the message.
	 *
	 * @throws an exception if the method cannot send for any reason
	 */
	public void send(String msg) throws Exception
	{
		// Force \r\n since println() behaves differently on different platforms
		this.writer.print(msg + "\r\n");
		this.writer.flush();
	}

	/**
	 * Throws an exception if the response does not start with
	 * the specified string.
	 */
	public void expect(String expect) throws Exception
	{
		String response = this.readResponse();
		if (!response.startsWith(expect))
			throw new Exception("Got: " + response + " Expected: " + expect);
	}

	/**
	 * Throws an exception if the response does not contain
	 * the specified string.
	 */
	public void expectContains(String expect) throws Exception
	{
	    String response = this.readResponse();
	    if (!response.contains(expect))
	        throw new Exception("Got: " + response + " Expected to contain: " + expect);
	}

	/**
	 * Get the complete response, including a multiline response.
	 * Newlines are included.
	 */
	protected String readResponse() throws Exception
	{
		StringBuilder builder = new StringBuilder();
		boolean done = false;
		while (!done)
		{
			String line = this.reader.readLine();
			if (line.charAt(3) != '-')
				done = true;

			builder.append(line);
			builder.append('\n');
		}

		return builder.toString();
	}

	/** */
	public void close() throws Exception
	{
		if (!this.socket.isClosed())
			this.socket.close();
	}
}