I was wondering how to block attachments to gmail. I am running squid 2.7 stab9 with dansguardian 2.10, users authenticated from LDAP. I have configured the POST restrictions in Dansguardian which does block all attachments to hotmail/yahoo etc etc but attachments to gmail continue to upload. I have tried

acl fileupload req_mime_type -i multipart/form-data
acl fileupload req_mime_type -i ^multipart/form-data$

acl UPLIMIT req_header Content-Length [5-9][0-9]{5,}
acl UPMETH method post

request_body_max_size

but nothing seems to work on it....

any suggestions/pointers would be highly appreciated.

Regards

You might want to show us what the access log looks like when an attachment is done. That said, Gmail uses encrypted connections, so you're probably out of luck here.