Postfix mail server limit the mailbox size

So how do you limit the mailbox size for users configured with the Postfix mail server?

It is good choice to avoid problem (disk DoS) by limiting mailbox size. This will avoid the user or hacker to eat up all hard disk space.

Display the default mailbox size limit

Type the following command:
# postconf mailbox_size_limit
Output:

mailbox_size_limit = 51200000

51200000 bytes is default mailbox size limit.

Display the default maximum size in bytes of a message

Type the following command:
# postconf message_size_limit
Output:

message_size_limit = 10240000

Setup new mailbozsize limit

Open file /etc/postfix/main.cf and
# vi /etc/postfix/main.cf
Add/modify/set values as follows:
mailbox_size_limit = 30000000
message_size_limit = 10240000

Save and restart postfix mail server:
# /etc/init.d/postfix restart

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