使用阿里企业邮件，发送报错526 Authentication failure

1.配置服务器地址smtp.lepont.com.cn
2.配置用户 system@lepont.com.cn
3.密码也和实际一致
4.mail.smtp.auth 为true


通过企业邮箱客户端界面，使用 system@lepont.com.cn对外发送邮件成功，但是在后台java中使用以上(1,2,3,4)的配置，往外发送邮件，始终报如下错误：

===============================
DEBUG: getProvider() returning javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Sun Microsystems, Inc]
DEBUG SMTP: useEhlo true, useAuth true
DEBUG SMTP: useEhlo true, useAuth true
DEBUG SMTP: trying to connect to host "smtp.lepont.com.cn", port 25, isSSL false
220 smtp.aliyun-inc.com MX AliMail Server(10.147.40.44)
DEBUG SMTP: connected to host "smtp.lepont.com.cn", port: 25


EHLO Lxh-PC
250-smtp.aliyun-inc.com
250-STARTTLS
250-8BITMIME
250-AUTH=PLAIN LOGIN XALIOAUTH
250-AUTH PLAIN LOGIN XALIOAUTH
250-PIPELINING
250 DSN
DEBUG SMTP: Found extension "STARTTLS", arg ""
DEBUG SMTP: Found extension "8BITMIME", arg ""
DEBUG SMTP: Found extension "AUTH=PLAIN", arg "LOGIN XALIOAUTH"
DEBUG SMTP: Found extension "AUTH", arg "PLAIN LOGIN XALIOAUTH"
DEBUG SMTP: Found extension "PIPELINING", arg ""
DEBUG SMTP: Found extension "DSN", arg ""
DEBUG SMTP: Attempt to authenticate
AUTH LOGIN
334 dXNlcm5hbWU6
a2xhZEBsZXBvbnQuY29tLmNu
334 UGFzc3dvcmQ6
Q2VsZW50aTk5
526 Authentication failure[0]