Sent messages go to outbox

I can receive emails and send in web mail but in eM client all sent messages go to outbox only and wont send. Error message says ‘could be caused by temporary server unavailability’… 2 days now

Who handles your outbound mail?
Have you tried temporarily completely disabling anti-virus and VPN apps?

Thanks, all ok now. I think the server was reconnected. I didnt actually have the courage do anything.