Fill in the blank. A _____ is a permanent delivery error. By vmartinez Fill in the blank. A _____ is a permanent delivery error. sender reputation hard bounce soft bounce designated IP address A hard bounce is a permanent delivery error. Related content Related questions:Fill in the blank: Exploiting human error to gain…Fill in the blank: Social engineering is a…Fill in the blank: Social engineering is a _____…Fill in the blank: _____ role is when you partner…