The following script will go through all your cPanel users and their domains, and print on the terminal a list of all current email accounts.
cat /etc/userdomains | sed "s/://g" | awk {'system("ls -1d /home/"$2"/mail/"$1"/* 2> /dev/null")'} | sed "s/\// /g" | awk {'print $5"@"$4'}

![WARNING: [pool user_USERNAME] server reached pm.max_children setting (25), consider raising it Screen Shot 2020 06 23 at 09.57.51 - WARNING: [pool user_USERNAME] server reached pm.max_children setting (25), consider raising it](https://i0.wp.com/administrator.pejcic.rs/wp-content/uploads/2026/09/Screen-Shot-2020-06-23-at-09.57.51.png?resize=344%2C194&ssl=1)

![node[175421]: pthread_create: Resource temporarily unavailable 2023 08 28 12 15 - node[175421]: pthread_create: Resource temporarily unavailable](https://i0.wp.com/administrator.pejcic.rs/wp-content/uploads/2023/08/2023-08-28_12-15.png?resize=344%2C194&ssl=1)