In-box fill' is a job title that refers to someone who is responsible for managing the incoming mail of an organization. This includes sorting and organizing EMAILS, MEMOS, and other documents that come into the organization's inbox. The crossword solutions for the term 'in-box fill' are EMAIL (5 letters), MEMOS (5 letters), and EMAILS (6 letters). Email is an electronic form of communication that is sent over the internet, while MEMOS are short documents that are used to communicate information within an organization. EMAILS are a combination of both EMAILS and MEMOS, as they are sent electronically but can contain information similar to that of a memo.