Hello everyone, I'm so sorry to bother you, but I need support, are you willing to help me?

I configured the outlook for my mail host. I'm sent "error test e-mail message: the server responded 421.4.4.5 directory harve" I tried to change ports: 995 - 465, 995 - 587, including 110 - 25 and 110 -587 But the thing is not.

Looking forward to receiving everyone's help I'm too disappointed