Site Administration, Server, Support Contact, Support Email = ABcdef@Test.com
Above is the actual From address used by Moodle. So this address must be the same as the authentication account details in the mail settings:
Site Administration, Plugins, Messaging Outputs, Email...
SMTP Hosts: smtp.office365.com:587
SMTP Security: TLS
SMTP Username: ABcdef@Test.com
SMTP Password: office365password
SMTP Session Limit: 1
No-reply address: ABcdef@Test.com
This is what clinched it for me.
I tried changing the support and am getting the same result
I'm still getting:
NOTICE: PHP message: PHP Notice: Error calling message processor email<ul style="text-align: left" data-rel="backtrace"><li>line 118 of /lib/classes/message/manager.php: call to debugging()</li><li>line 82 of /lib/classes/message/manager.php: call to core\message\manager::send_message_to_processors()</li><li>line 229 of /lib/messagelib.php: call to core\message\manager::send_message()</li><li>line 2182 of /message/lib.php: call to message_send()</li><li>line 182 of /message/index.php: call to message_post_message()</li></ul> in /var/www/pia2015/lib/weblib.php on line 2949
