how to block users in squid uploading files more than 10 mb through mail

I installed squid in ubuntu linux.How to restrict users to uploading files using e-mail accounts more than 10mb files.

Solution

You probably mean uploading files throught webmail service. If so, then you need to limit request header size using request_header_max_size.

Also you should create some URL patterns to which this rule will apply using acl, or it will apply to all POST requests.

try such of this piece of config

acl limitedpost url_regex ^http://www.somewebmail.com/mail/$
http_access allow limitedpost AND request_body_max_size 10240 KB