Blocking attachments

Hi guys!

Due to information leaking from my company, i need to prevent sending
certain file types from inside to outside. However, sending attachments
of those types shoild be allowed from inside users to inside users, and
from outside to inside.

Is there a posibility to do this with postfix restriction rules?

I do filter messages by file type using header_checks regexp, but this
aplies to ALL attachments, so i cannot use this feature to solve my
issue.

I appreciate your time!

Best wishes,

On Thu, 03 Mar 2005 00:50:20 -0800, pop wrote:

>
> Hi guys!
>
> Due to information leaking from my company, i need to prevent sending
> certain file types from inside to outside. However, sending attachments
> of those types shoild be allowed from inside users to inside users, and
> from outside to inside.
>
> Is there a posibility to do this with postfix restriction rules?
>
> I do filter messages by file type using header_checks regexp, but this
> aplies to ALL attachments, so i cannot use this feature to solve my
> issue.
>
> I appreciate your time!
>
> Best wishes,

Use a second postfix instance for outbound mail and use appropriate
head/mime_header and body_checks fir the outbound instance. Google for
second postfix instance. There are several website with good examples.

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