How to fix 552 5.3.4 Error: message file too big in CENTOS

When user send a mail of 10 MB or more, all users using Webmail or MS Outlook as mail client.

will getting this error 552 5.3.4 Error: message file too big.

http://www.postfix.org/postconf.5.html 

Read message_size_limit and mailbox_size_limit

Edit /etc/postfix/main.cf and add the following line
for 20MB in bytes as example: 

message_size_limit = 20971520 

And also adjust mailbox_size_limit same as message_size_limit
mailbox_size_limit = 20971520

then 

postfix reload