关于JAVA MAIL发送问题 - Java / Java EE

首先，发送方法肯定没错。。。
我用sina的发送 debug都没出错~见图
我是一次发送给多人，为什么debug没错而我在web mail里收不到呢？大家帮帮我吧~

---

DEBUG: setDebug: JavaMail version 1.4.2
DEBUG: getProvider() returning javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Sun Microsystems, Inc]
DEBUG SMTP: useEhlo true, useAuth true
DEBUG SMTP: trying to connect to host "smtp.sina.com", port 25, isSSL false
220 irxd5-187.sinamail.sina.com.cn ESMTP
DEBUG SMTP: connected to host "smtp.sina.com", port: 25

EHLO sl-92d51eb29214
250-irxd5-187.sinamail.sina.com.cn
250-8BITMIME
250-SIZE 83886080
250-AUTH PLAIN LOGIN
250 AUTH=PLAIN LOGIN
DEBUG SMTP: Found extension "8BITMIME", arg ""
DEBUG SMTP: Found extension "SIZE", arg "83886080"
DEBUG SMTP: Found extension "AUTH", arg "PLAIN LOGIN"
DEBUG SMTP: Found extension "AUTH=PLAIN", arg "LOGIN"
DEBUG SMTP: Attempt to authenticate
DEBUG SMTP: check mechanisms: LOGIN PLAIN DIGEST-MD5 
AUTH LOGIN
334 VXNlcm5hbWU6
YmpfbGluZw==
334 UGFzc3dvcmQ6
ODcwODIy
235 #2.0.0 OK Authenticated
DEBUG SMTP: use8bit false
MAIL from:<fanzao@yahoo.com>
250 sender <fanzao@yahoo.com> ok
RCPT TO:<bj_ling@yahoo.cn>
250 recipient <bj_ling@yahoo.cn> ok
DEBUG SMTP: Verified