Problems with sending emails from my Outlook via my orange a/c

I have Outlook on my desktop and emails are coming in when I press send/receive but I’ve got three waiting to go in my outbox and they are refusing to go.
Done all the usual - closed down outlook / checked task manager (no probs) /turned off computer.

I’m wondering if it’s some communication problem with outgoing emails at the orange end.

Anyone else having problems this morning?