When sending emails, it will go to outbox and keep sending? only when moved manualy to send box, it will stop sending?

When sending emails, it will go to outbox and keep sending? Only when moved manually to send box?

Is this happening with all messages, or just a specific message?

I’ve been getting this problem for a while. Messages go into the Outbox and despite clicking send all or refresh they stay in the outbox. The recipient tells me that they receive the message multiple times, possibly each time I click Sens All. All this morning’s messages, over 30 are sitting in my out box and I can’t tell if they have gone or not.