I am using Thunderbird ( currently 16.0.2) for a long time in Ubuntu .
it works perfectly .
But in two weeks , I got a notification: gmail account exceeded command or bandwidth limits , and I can not send email as well as receiving email using Thunderbird and iPhone.

I didn't use Mail client ( thunderbird and iphone) for 1 day after that.
And Now , I can read email but can not sending email.

The message could not be sent because the connection to SMTP server smtp.googlemail.com timed out. Try again or contact your network administrator.

I try to telnet smtp.googlemail.com port 465 but no luck., port 587 is ok.
I change the the SMTP server to port 587. But I still can not send email.

It show : connected to smtp.googlemail.com , but still show that window , and never send the email.

Any idea ?
Thank you very much.