Hi Mouss, Thank you for your information.
>Are you using a proxy_filter? if so, take a look at > http://www.postfix.org/SMTPD_PROXY_README.html >and search for "queue file write error". No, no proxy_filter enable. I am using Ubuntu 8.04.2 LTS Postix package, and the section for proxy_filter is disabled. >if not, is chroot enabled in your master.cf? (some packages enable it by >default, so please check). make sure the 5th field is 'n' (and not 'y' >nor '-') I have disbabled chroot in master.cf, but the problem remains. After checking the verbose log, I notice one thing strange. Though the virtual_alias_maps by hash and LDAP return the same results :- >postmap -q 'venus....@auth.hk1.sml.citizen.co.jp' hash:/etc/postfix/virtual venus....@imapsv02.auth.hk1.sml.citizen.co.jp >postmap -q 'venus....@auth.hk1.sml.citizen.co.jp' ldap:/etc/postfix/ldap-virtualalias venus....@imapsv02.auth.hk1.sml.citizen.co.jp however, there is an error about cleanup server in the verbose log when using LDAP :- < Jul 24 14:16:22 imapsv02 postfix/smtpd[17966]: BD1B825E43: client=imapsv02.auth.hk1.sml.citizen.co.jp[10.144.1.50] < Jul 24 14:16:22 imapsv02 postfix/smtpd[17966]: > imapsv02.auth.hk1.sml.citizen.co.jp[10.144.1.50]: 250 2.1.5 Ok < Jul 24 14:16:22 imapsv02 postfix/master[17734]: warning: process /usr/lib/postfix/cleanup pid 17969 exit status 2 < Jul 24 14:16:22 imapsv02 postfix/master[17734]: warning: /usr/lib/postfix/cleanup: bad command startup -- throttling < Jul 24 14:16:24 imapsv02 postfix/smtpd[17966]: < imapsv02.auth.hk1.sml.citizen.co.jp[10.144.1.50]: data < Jul 24 14:16:24 imapsv02 postfix/smtpd[17966]: > imapsv02.auth.hk1.sml.citizen.co.jp[10.144.1.50]: 354 End data with <CR><LF>.<CR><LF> < Jul 24 14:16:31 imapsv02 postfix/smtpd[17966]: > imapsv02.auth.hk1.sml.citizen.co.jp[10.144.1.50]: 451 4.3.0 Error: queue file write error < Jul 24 14:16:32 imapsv02 postfix/smtpd[17966]: < imapsv02.auth.hk1.sml.citizen.co.jp[10.144.1.50]: quit I googled the problem, but find no clue. Any idea? Thanks a lot. John Mok