Email SMTP error

Hello, I am getting the following errors this morning:

"Unable to connect SMTP server:http://mail.pension-experts.com Reason: Unknown host"

"Unable to connect to SMTP server:http://smtp.gmail.com , Port465Reason:Network is unreachable"

I can't seem to send any emails. Problem is new and no changes have been made in the settings.

Please help quick.

Thanks,

-Vikram