After updating from Moodle 1.8.6 to 1.9 , we have a number of issues.
First, when users send messages through the Moodle system, they used to go to their mail. Now we receive the following error:
SMTP -> ERROR: Failed to connect to server: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond. (10060) ERROR: SMTP Error: Could not connect to SMTP host.