Dear all, I've installed KOHA version 3.16.08.000. I've setup the postfix and tested ok by sending emails to another account. and received message from mail.log like below: Jul 15 10:57:37 ubuntu postfix/smtp[3524]: 1EFD0A4252F: to=< hychong@edgetech.com.my>, relay=smtp.gmail.com[74.125.130.108]:587, delay=5.2, delays=0.09/0.01/3.2/2, dsn=2.0.0, status=sent (250 2.0.0 OK 1436929057 ez4sm2798103pbb.13 - gsmtp) Jul 15 10:57:37 ubuntu postfix/smtp[3524]: 1EFD0A4252F: to=< edgetech.sales@gmail.com>, relay=smtp.gmail.com[74.125.130.108]:587, delay=5.2, delays=0.09/0.01/3.2/2, dsn=2.0.0, status=sent (250 2.0.0 OK 1436929057 ez4sm2798103pbb.13 - gsmtp) Jul 15 10:57:37 ubuntu postfix/smtp[3524]: 1EFD0A4252F: to=<root@ubuntu>, relay=smtp.gmail.com[74.125.130.108]:587, delay=5.2, delays=0.09/0.01/3.2/2, dsn=2.0.0, status=sent (250 2.0.0 OK 1436929057 ez4sm2798103pbb.13 - gsmtp) Jul 15 10:57:37 ubuntu postfix/qmgr[3394]: 1EFD0A4252F: removed However the system failed to send email to the newly created patron's email account and I received message from mail.log like below: Jul 15 11:02:57 ubuntu postfix/smtpd[3609]: connect from localhost[127.0.0.1] Jul 15 11:02:57 ubuntu postfix/smtpd[3609]: A25FBA4252C: client=localhost[127.0.0.1] Jul 15 11:02:57 ubuntu postfix/cleanup[3612]: A25FBA4252C: message-id=< 20150715030257.A25FBA4252C@yourlibrary.vn> Jul 15 11:02:57 ubuntu postfix/qmgr[3394]: A25FBA4252C: from=< edgetech.sales@gmail.com>, size=764, nrcpt=1 (queue active) Jul 15 11:02:57 ubuntu postfix/smtpd[3609]: disconnect from localhost[127.0.0.1] Jul 15 11:02:57 ubuntu postfix/error[3613]: A25FBA4252C: to=< victorchy1981@gmail.com>, relay=none, delay=0.27, delays=0.11/0.04/0/0.11, dsn=4.4.1, status=deferred (delivery temporarily suspended: connect to 127.0.0.1[127.0.0.1]:10024: Connection refused) Please advice. Thanks. Chong