Hi, 1) I removed all cron entries by crontab -r 2) did # sudo koha-shell igntucl ( as koha default user created by package installation) 3) crontab -e igntucl-koha crontab.example 4) manually did bin/process_message_queue.pl as (igntucl-koha) user 5) mail notices status changed to - sent 6) mail log for igntucl-koha user shows; root@testserver:/var/mail# tail -f igntucl-koha X-Cron-Env: <KOHA_CRON_PATH=/usr/share/koha/bin/cronjobs> X-Cron-Env: <SHELL=/bin/sh> X-Cron-Env: <HOME=/var/lib/koha/igntucl> X-Cron-Env: <PATH=/usr/bin:/bin> X-Cron-Env: <LOGNAME=igntucl-koha> Message-Id: <20180209112001.B9011120779@testserver.localdomain> Date: Fri, 9 Feb 2018 16:50:01 +0530 (IST) /bin/sh: 1: __KOHA_USER__: not found 7) koha installation has a public ip, and is it related to localdomain in the Message-Id. 8) manually did bin/process_message_queue.pl as root user. 9) mail notices status changed to - sent 10) but not received any mail to inbox 11) mail log shows: root@testserver:/var/mail# tail -f root BEGIN failed--compilation aborted at /usr/share/koha/lib/Koha/Config/SysPref.pm line 26. Compilation failed in require at /usr/share/koha/lib/C4/Context.pm line 105. BEGIN failed--compilation aborted at /usr/share/koha/lib/C4/Context.pm line 105. Compilation failed in require at /usr/share/koha/lib/C4/Members.pm line 25. BEGIN failed--compilation aborted at /usr/share/koha/lib/C4/Members.pm line 25. Compilation failed in require at /usr/share/koha/lib/C4/Letters.pm line 30. BEGIN failed--compilation aborted at /usr/share/koha/lib/C4/Letters.pm line 30. Compilation failed in require at /usr/share/koha/bin/cronjobs/ process_message_queue.pl line 28. BEGIN failed--compilation aborted at /usr/share/koha/bin/cronjobs/ process_message_queue.pl line 28. 13) should : __KOHA_USER__: to replaced as* root *or* igntucl-koha* 12) does it mean, a postfix issue?? expecting your thoughts!! Thanks & Regards Satish