Hi, all .

one of the mail user in my mail system can not send mail bu mail cleint . I check up the log , I found that the user have authenticated successful, but can not send mail .

here is the logs :

Apr 14 17:08:38 sub postfix/smtpd[25245]: connect from unknown[116.24.31.184]
Apr 14 17:08:38 sub postfix/smtpd[25245]: setting up TLS connection from unknown[116.24.31.184]
Apr 14 17:08:38 sub postfix/smtpd[25245]: TLS connection established from unknown[116.24.31.184]: TLSv1 with cipher RC4-MD5 (128/128 bits)
Apr 14 17:08:40 sub saslauthd[2958]: zmauth: authenticating against elected url 'https://sub.siat.ac.cn:7071/service/admin/soap/' ...
Apr 14 17:08:40 sub saslauthd[2958]: zmpost: url='https://sub.siat.ac.cn:7071/service/admin/soap/' returned buffer->data='<soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope"><soap:Header><context xmlns="urn:zimbra"><change token="1124"/></context></soap:Header><soap:Body><AuthResponse xmlns="urn:zimbraAccount"><authToken>0_3ccbccbb68e e5ccd464dfb28894e83d889f3e539_69643d33363a66613938 623966642d613232342d343765632d393831342d6636353962 343230386164313b6578703d31333a31323038333336393230 3037303b747970653d363a7a696d6272613b6d61696c686f73 743d31373a3231302e37352e3235322e3130393a38303b</authToken><lifetime>172800000</lifetime><skin>beach</skin></AuthResponse></soap:Body></soap:Envelope>', hti->error=''
Apr 14 17:08:40 sub saslauthd[2958]: auth_zimbra: chaoyong@kangva.com auth OK
Apr 14 17:08:40 sub postfix/smtpd[25245]: 861C41DFE05: client=unknown[116.24.31.184], sasl_method=LOGIN, sasl_username=chaoyong@kangva.com
Apr 14 17:08:41 sub postfix/cleanup[25244]: 861C41DFE05: message-id=<00f601c89e0e$7dc82aa0$79587fe0$@com>
Apr 14 17:09:57 sub postfix/smtpd[28879]: timeout after DATA from unknown[116.24.31.184]
Apr 14 17:09:57 sub postfix/smtpd[28879]: disconnect from unknown[116.24.31.184]

can any body tell me a solution, thanks !