How can i collect email's customers in Directadmin

I want collect email's customers to send notification email to all customers but i don't find in databases dỉectadmin,
Please help me.
Thanks,

as admin, list all the users:
select all using checkbox:
there's an option at bottom to email them all.

you can do same with resellers only:
as admin, list all the resellers:
select all using checkbox:
there's an option at bottom to email them all.