Instead of attempting to connect to smtp.gmail.com on port 465, the auth proxy is attempting to a host called 'smtp.gmail.com:465' on port 25:
2012-07-07 19:27:04.227566500 No SMTP connection to server smtp.gmail.com:465 on port 25
Did you configure this via the server-manager panel? If so, it needs to be fixed, and you should create a bug report in the bug tracker so that that can be done.
Meanwhile, see if you can fix the configuration - you want port 465, and hostname of just smtp.gmail.com.
Is smtp.gmail.com really your ISP's mail server?