Sendmail limits the mailbox size

Sendmail limits the size of the mailbox space-Linux Enterprise Application-Linux server application information. The following is a detailed description. In sendmail, each user has a mailbox

What I want to achieve is that the free mailboxes on the Internet have a limit on the mailbox space. Some mailbox spaces are larger, and some mailbox spaces are smaller,

How can I implement sendmail?

Ls-al/var/mail/

Drwxrexr-x 2 root mail 4096 April 11 13:25.

Drwxr-xr-x 19 root 4096 March 28 01:11 ..

-Rw ---- 1 jyhuang mail 70600 April 7 02:02 jyhuang

-Rw ------- 1 root 4075 March 30 04:02 root

-Rw ---- 1 sundyhuang mail 73743 02:45 sundyhuang

-Rw ---- 1 sundyw mail 10037 April 6 18:44 sundyw

Whether to implement the disk quota in the above directory, or use other methods

Please help