Hi,
I've updated dev.moodle.org to latest 1.9.3+
Executed cron manually I got this:
1)- module forum mails properly processed. 
2)- later, got this in cron execution:
Fatal error: Call to a member function get_private_key() on a non-object in .....mnet/lib.php on line 166
3)- Checked mail queue and it seems that mail.moodle.org (server8) isn't accepting connections from dev.moodle.org. There are 2100 mails refused in the queue.
So, there is one bug in MNET cron and... mail.moodle.org must accept SMTP connections from dev.moodle.org.
Ciao 
Hi,
I've updated dev.moodle.org to latest 1.9.3+
Executed cron manually I got this:
1)- module forum mails properly processed.
2)- later, got this in cron execution:
Fatal error: Call to a member function get_private_key() on a non-object in .....mnet/lib.php on line 166
3)- Checked mail queue and it seems that mail.moodle.org (server8) isn't accepting connections from dev.moodle.org. There are 2100 mails refused in the queue.
So, there is one bug in MNET cron and... mail.moodle.org must accept SMTP connections from dev.moodle.org.
Ciao