Problema mailSender en Spring Framework

[biyonder]

Buenos días chicos!

Tengo un problema con una configuración de envío de correo en Spring. He definido un bean de mailSender para ello, y configurado un servidor SMTP en local para envíos en local con Mercury (para las pruebas es lo mejor ya que en la empresa tenemos un proxy que capa muchas conexiones). El servidor funciona correctamente, he probado a enviarme correos y los recibo en localhost perfectamente. El problema viene con la configuración del mailSender. Os pego el snippet:

<bean id="mailSender" class="org.springframework.mail.javamail.JavaMailSenderImpl">
		<property name="javaMailProperties">
			<props>
				<prop key="mail.from">[email protected]</prop>
				<prop key="mail.debug">true</prop>
			</props>
		</property>
		<property name="host" value="127.0.0.1" />
		<property name="port" value="25" />
		<property name="username" value="ejemplo" />
		<property name="password" value="123123" />
	</bean>

¿Se os ocurre cual podría ser el problema? Gracias de antemano!

Se me pasó pegaros la excepción:

DEBUG: JavaMail version 1.4.7
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,Oracle], com.sun.mail.smtp.SMTPTransport=javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Oracle], com.sun.mail.imap.IMAPSSLStore=javax.mail.Provider[STORE,imaps,com.sun.mail.imap.IMAPSSLStore,Oracle], com.sun.mail.pop3.POP3SSLStore=javax.mail.Provider[STORE,pop3s,com.sun.mail.pop3.POP3SSLStore,Oracle], com.sun.mail.imap.IMAPStore=javax.mail.Provider[STORE,imap,com.sun.mail.imap.IMAPStore,Oracle], com.sun.mail.pop3.POP3Store=javax.mail.Provider[STORE,pop3,com.sun.mail.pop3.POP3Store,Oracle]}
DEBUG: Providers Listed By Protocol: {imaps=javax.mail.Provider[STORE,imaps,com.sun.mail.imap.IMAPSSLStore,Oracle], imap=javax.mail.Provider[STORE,imap,com.sun.mail.imap.IMAPStore,Oracle], smtps=javax.mail.Provider[TRANSPORT,smtps,com.sun.mail.smtp.SMTPSSLTransport,Oracle], pop3=javax.mail.Provider[STORE,pop3,com.sun.mail.pop3.POP3Store,Oracle], pop3s=javax.mail.Provider[STORE,pop3s,com.sun.mail.pop3.POP3SSLStore,Oracle], smtp=javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Oracle]}
DEBUG: successfully loaded resource: /META-INF/javamail.default.address.map
DEBUG: getProvider() returning javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Oracle]
DEBUG SMTP: useEhlo true, useAuth false
DEBUG SMTP: trying to connect to host "127.0.0.1", port 25, isSSL false
TRACK trace : org.springframework.mail.MailSendException: Mail server connection failed; nested exception is javax.mail.MessagingException: Could not connect to SMTP host: 127.0.0.1, port: 25;
  nested exception is:
	java.net.SocketException: Permission denied: connect