The most common and most likely answer to this crossword clue is the 5 letter word INBOX
I
N
B
O
X
More clues leading to the result INBOX
Buddy explains!

The straight part
We know that "Emails appear here" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case emails appear here = inbox.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does INBOX mean?
INBOX noun- A container in which papers to be dealt with are put.
- An electronic folder serving the same purpose.
- The aggregate of items that demand one's attention or effort.
- To put (something) in someone's inbox.
- To communicate with (a person) by writing to their electronic inbox.