blocking people from attaching files to web based emails

Hi,

In our office, we have Websense which blocks certain sites. We still allow users to use web based emails such as Gmail, Yahoo Mail etc.

Is there any way to let users access such web based emails but block them from attaching files to these emails.

Thanks and best regards, Ashish

Reply to
Ashish Gupta
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hi,

u can see under analyzer real time what's happen.

maybe this using https and not http.

cheers

Ashish Gupta wrote:

Reply to
Jean Figueiredo

Not with a firewall. Your MTA or MSA programs are what you should look at.

Reply to
D. Stussy

Not with a firewall. Your MTA or MSA programs are what you should look at.

Reply to
D. Stussy

What MTA or MSA would you expect is being used when a user accesses their own web based email account?

Reply to
DevilsPGD

Hi,

This could be very difficult or impossible. The best thing to do is block the users from accessing web-based emails.

Giorgos

Reply to
geoar75

I have no expectation whatsoever in that case. However, web servers themselves aren't mail servers, so it must hand off any outbound message to something that does handle mail.

Reply to
D. Stussy

I have no expectation whatsoever in that case. However, web servers themselves aren't mail servers, so it must hand off any outbound message to something that does handle mail.

Reply to
D. Stussy

However, in case of webmailers both the web and the mail server are not under your control.

To suppress sending of attechments through webmailers you'd have to inspect the unencrypted datastream. Meaning you'd have to either

- block SSL encrypted sessions to the webmailer

- break the SSL encryption for connections to the webmailer

However, that could get you into all kinds of privacy-related trouble, so I'd advise against doing so. Plus, an inside attacker could still encode any given file and send it inline, so just blocking attachments won't really help you here.

cu

59cobalt
Reply to
Ansgar -59cobalt- Wiechers

Right -- So how would a local LAN intercept/handle mail being passed from Gmail's web server to Gmail's SMTP server?

Reply to
DevilsPGD

It can't. However, where people run their OWN webmail (e.g. horde), such can be stripped off.

Reply to
D. Stussy

It can't. However, where people run their OWN webmail (e.g. horde), such can be stripped off.

Reply to
D. Stussy

It can't. However, where people run their OWN webmail (e.g. horde), such can be stripped off.

Reply to
D. Stussy

It can't. However, where people run their OWN webmail (e.g. horde), such can be stripped off.

Reply to
D. Stussy

It can't. However, where people run their OWN webmail (e.g. horde), such can be stripped off.

Reply to
D. Stussy

^^^^^^^^^^^^^^^^^^^^^^

[...]

However, the OP was specifically asking about *public* webmailers.

cu

59cobalt
Reply to
Ansgar -59cobalt- Wiechers

We heard you the first time.

Reply to
Jon Solberg

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