Deleted emails keep reloading/ not sending

Two more problems which are constantly happening. I read then delete email and a few seconds later it appears back in “IN” box. Also have tried sending emails via Yahoo and Gmail but always end up in “outbox” Have tried refreshing, going to drop down menu and tried “send/receive all” and “send” only. Nothing seems to work. I now copy and paste into “outlook” no problems at all.