Problem: since a few days I can receive mails but not send new mails. Where is the problem ?

My eMclient receives mail but is not capable of sending  new mail. The problem started a few days ago.

Are you getting any error messages? You will find errors in Menu > Tools > Operations.

One thing you can try is to disable your anti-virus and firewall and then try again.

Have you checked that your Port settings are correct