Cant sent mails with eM Client. On other clients everything is working

I am using em Client for a few days. Everything was ok until last night i tried to send a mail and it does not get send. When i reopen em Client it shows me a message that i have a problem with the SMPT server. I tried the diagnose and fix option but it cant fix it.  

I have screenshots of the log and the message just don`t know where to attach them

When composing a message in this forum, there is a camera icon below the text box. Click that and select your screenshot to upload.

And the message