Mailman version 2.1.16
Installed via apt-get
Server OS is Ubuntu 14.04.3 LTS
MTA is postfix version 2.11.0
When a user subscribes to the email list, an approval email is not being
sent to the admins/moderators. The variables admin_immed_notify and
admin_notify_mchanges are set to yes. The subscribe requests are getting
picked up during the daily cron job and an email is then sent at 8:00 AM.
Test emails to -owner work internally from postfix and when sent externally
Here's a link to all the log file snippets from the time of the subscribe
Any ideas where to start troubleshooting this issue?