Error send mail

I can not send you mail by the client. the outlook of the office as they are. My company’s systems block port 80

unfortunatelly it is hard to determine your issue without additional information.

What version of eM Client are you currently running? Please check the Help>About section for full version number.
Can you copy the error message you get when you try to send a message?
Copy the content of the Tools>Operations window’s Error and Log tabs.