cannot send emails since changing internet service

I cannot send emails -  the error message says there is a temporary server unavailability or incorrect settings.  I have remained with the same internet provider for emails and so only needed to change the SMTP host server setting for outgoing messages and this has been done with info from the new internet provider.  I can send messages via the web, i.e. not using eM client (version 7.0.27943.0).
Also, I have noticed the same error message in the past but this could be overcome by either closing eM client and re-opening or restarting my computer (doesn’t work now) - I did not know if the problem was with the server or with eM client but perhaps it was the latter.

Hello Maria,

I will need your help in order to resolve your issue.
Could you send us copy of logs?
To provide us with logs from Menu>Tools>Operations>Log and copy with Ctrl+A, paste to notepad then send the file to