Hello, When I do an alarm, the file eventengine.log receive the alert but with the following errors and I don't receive a mail: [2015-06-12 14:08:55,014] [INFO] [pid=26242 nav.alertengine.handle_new_alerts] alert 55 queued for admin due to subscription 1 [2015-06-12 14:09:21,098] [ERROR] [pid=26242 nav.alertengine.alertaddress.send] Email raised a DispatcherException indicating that an alert could not be sent at this time: Could not send email: Connection unexpectedly closed" Traceback (most recent call last): File "/usr/lib/python2.7/logging/handlers.py", line 926, in emit smtp.sendmail(self.fromaddr, self.toaddrs, msg) File "/usr/lib/python2.7/smtplib.py", line 722, in sendmail raise SMTPSenderRefused(code, resp, from_addr) SMTPSenderRefused: (553, 'sender domain must exist', 'navcron@navappliance') Logged from file profiles.py, line 377 [2015-06-12 14:09:21,655] [INFO] [pid=26242 nav.alertengine.check_alerts] 1 new alert(s), sent 0 alert(s), 1 queued alert(s), 0 alert(s) deleted, 1 failed send(s), 0 ignored [2015-06-12 14:09:21,656] [WARNING] [pid=26242 nav.alertengine.check_alerts] Send 1 alerts failed. I configured Exim with the following parameters: dc_eximconfig_configtype='satellite' dc_other_hostnames='exinfrserv1.epfl.ch' dc_local_interfaces='127.0.0.1 ; ::1' dc_readhost='exinfrserv1.epfl.ch' dc_relay_domains='' dc_minimaldns='false' dc_relay_nets='' dc_smarthost='mail.epfl.ch' CFILEMODE='644' dc_use_split_config='false' dc_hide_mailname='' dc_mailname_in_oh='true' dc_localdelivery='mail_spool' When I test with the command 'echo "hello world" | mail -vv -s test nicolas.biselx@epfl.ch' The mail is sent and receive In nav.conf, I also configured DEFAULT_FROM_EMAIL=nicolas.biselx@epfl.ch EMAIL_HOST=mail.epfl.ch EMAIL_PORT=465 EMAIL_HOST_USER=biselx EMAIL_HOST_PASSWORD=******** EMAIL_USE_SSL=True I don't know what's wrong, Is it fair to configure Exim and nav.conf ? Is what I missed part of the configuration ? Regards, Biselx Nicolas