spring集成的javamail报错

Question

错误：
org.springframework.mail.MailSendException; nested exception details (1) are:
Failed message 1:
com.sun.mail.smtp.SMTPSendFailedException: 501 #5.1.3 Partial domain not allowed: '' at com.sun.mail.smtp.SMTPTransport.issueSendCommand(SMTPTransport.java:1388)
at com.sun.mail.smtp.SMTPTransport.mailFrom(SMTPTransport.java:959)
at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:583)
at org.springframework.mail.javamail.JavaMailSenderImpl.doSend(JavaMailSenderImpl.java:403)
at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:308)
at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:297)
at com.Test.mail.JavaMail.main(JavaMail.java:26)
代码：
<bean id="mailSender" class="org.springframework.mail.javamail.JavaMailSenderImpl">
   <property name="host">
    <value>smtp.sina.com.cn</value>
   </property>
   <property name="javaMailProperties">
    <props>
     <prop key="mail.smtp.auth">true</prop>
     <prop key="mail.smtp.timeout">25000</prop>
    </props>
  
   </property>
   <property name="username">
    <value>mytest510</value>
   </property>
   <property name="password">
    <value>fdsf</value>
   </property>
</bean>