Mails not being delivered because error "File too large"

Issue

• Postfix is not able to deliver messages to mailbox because limit of the mailbox size.
• /var/log/maillog show the following message:

Sep 26 03:05:01 server01 postfix/local[56145]: A1B2AB123456: to=<root@server01.example.com>, orig_to=<root>, relay=local, delay=0.18, delays=0.08/0.03/0/0.07, dsn=5.2.2, status=bounced (cannot update mailbox /var/mail/root for user root. error writing message: File too large)