List of all Emails on a Domain?

There are some locations like :

Code:

/home/$user/mail/$domain.com/ 

-- Which would show the email users that are tied to the domain that the directory is for.

As well you can use the uapi that @cPanelLauren has posted, and if you are more technically inclined you can use some regex to clean up the output

Code:

# uapi Email list_pops regex=[\S+@\S+] | grep -oP '(?<=email:[[:space:]]).+@\w+.\S+' 
user@domain.com 
user1@domain.com 
user2@domain.com 
user3@domain.com 

Which only provides the email accounts that are tied to the cPanel account and doesn't output the other pieces of information that would normally come out of using the uapi.