Sorry you're having trouble with the plugin. I've got the SMTP traffic
configured to use port 465 for smtp.gmail.com with SSL. Some firewalls
and ISPs have this port blocked as well...
You could try to run this on your command line and see if you get the
initial response from the Gmail server.
telnet smtp.gmail.com 465
If you don't get a response like "Connected to
gmail-smtp.l.google.com." then we know that something is blocking you
on that port. Unfortunately, the SMTP port is not user-configurable at
the moment... and if I recall correctly I couldn't get the alternate
587 port working with JavaMail.
In any case, let me know how this simple test goes and maybe we can
figure something out.
Regards,
JI