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Thread: blocking people from attaching files to web based emails

  1. #1
    Ashish Gupta
    Guest

    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

  2. #2
    Jean Figueiredo
    Guest

    Re: blocking people from attaching files to web based emails

    hi,

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

    maybe this using https and not http.

    cheers

    Ashish Gupta wrote:
    > 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


  3. #3
    D. Stussy
    Guest

    Re: blocking people from attaching files to web based emails

    "Ashish Gupta" <ashish.sarika@gmail.com> wrote in message
    news:fd35305b-6ab2-4df1-b6f0-3a3044aeda9b@w37g2000prg.googlegroups.com...
    > 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.


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



  4. #4
    D. Stussy
    Guest

    Re: blocking people from attaching files to web based emails

    "Ashish Gupta" <ashish.sarika@gmail.com> wrote in message
    news:fd35305b-6ab2-4df1-b6f0-3a3044aeda9b@w37g2000prg.googlegroups.com...
    > 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.


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



  5. #5
    DevilsPGD
    Guest

    Re: blocking people from attaching files to web based emails

    In message <hb8j8i$8ms$1@snarked.org> "D. Stussy"
    <spam+newsgroups@bde-arc.ampr.org> was claimed to have wrote:

    >"Ashish Gupta" <ashish.sarika@gmail.com> wrote in message
    >news:fd35305b-6ab2-4df1-b6f0-3a3044aeda9b@w37g2000prg.googlegroups.com...
    >> 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.

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


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

  6. #6
    geoar75@gmail.com
    Guest

    Re: blocking people from attaching files to web based emails

    Hi,

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

    Giorgos

    --

    NetPros Community
    http://netpros.freeforums.org

    On 15 Οκτ, 11:42, Ashish Gupta <ashish.sar...@gmail.com> wrote:
    > 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



  7. #7
    D. Stussy
    Guest

    Re: blocking people from attaching files to web based emails

    "DevilsPGD" <DeathToSpam@crazyhat.net> wrote in message
    news:ipqfd5dkak1nbniimdgljj6s1tn7aqflro@4ax.com...
    > In message <hb8j8i$8ms$1@snarked.org> "D. Stussy"
    > <spam+newsgroups@bde-arc.ampr.org> was claimed to have wrote:
    > >"Ashish Gupta" <ashish.sarika@gmail.com> wrote in message

    >
    >news:fd35305b-6ab2-4df1-b6f0-3a3044aeda9b@w37g2000prg.googlegroups.com...
    > >> 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.

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

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


    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.



  8. #8
    D. Stussy
    Guest

    Re: blocking people from attaching files to web based emails

    "DevilsPGD" <DeathToSpam@crazyhat.net> wrote in message
    news:ipqfd5dkak1nbniimdgljj6s1tn7aqflro@4ax.com...
    > In message <hb8j8i$8ms$1@snarked.org> "D. Stussy"
    > <spam+newsgroups@bde-arc.ampr.org> was claimed to have wrote:
    > >"Ashish Gupta" <ashish.sarika@gmail.com> wrote in message

    >
    >news:fd35305b-6ab2-4df1-b6f0-3a3044aeda9b@w37g2000prg.googlegroups.com...
    > >> 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.

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

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


    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.



  9. #9
    Ansgar -59cobalt- Wiechers
    Guest

    Re: blocking people from attaching files to web based emails

    D. Stussy <spam+newsgroups@bde-arc.ampr.org> wrote:
    > "DevilsPGD" <DeathToSpam@crazyhat.net> wrote:
    >> "D. Stussy" <spam+newsgroups@bde-arc.ampr.org> was claimed to have wrote:
    >>> "Ashish Gupta" <ashish.sarika@gmail.com> wrote:
    >>>> 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.
    >>>
    >>> Not with a firewall. Your MTA or MSA programs are what you should
    >>> look at.

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

    >
    > 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.


    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
    --
    "If a software developer ever believes a rootkit is a necessary part of
    their architecture they should go back and re-architect their solution."
    --Mark Russinovich

  10. #10
    DevilsPGD
    Guest

    Re: blocking people from attaching files to web based emails

    In message <hbaglk$k9r$2@snarked.org> "D. Stussy"
    <spam+newsgroups@bde-arc.ampr.org> was claimed to have wrote:

    >"DevilsPGD" <DeathToSpam@crazyhat.net> wrote in message
    >news:ipqfd5dkak1nbniimdgljj6s1tn7aqflro@4ax.com...
    >> In message <hb8j8i$8ms$1@snarked.org> "D. Stussy"
    >> <spam+newsgroups@bde-arc.ampr.org> was claimed to have wrote:
    >> >"Ashish Gupta" <ashish.sarika@gmail.com> wrote in message

    >>
    >>news:fd35305b-6ab2-4df1-b6f0-3a3044aeda9b@w37g2000prg.googlegroups.com...
    >> >> 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.
    >> >
    >> >Not with a firewall. Your MTA or MSA programs are what you should look

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

    >
    >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.
    >


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

  11. #11
    D. Stussy
    Guest

    Re: blocking people from attaching files to web based emails

    "DevilsPGD" <DeathToSpam@crazyhat.net> wrote in message
    news:62dkd5dsb0fd659q8b6bbjhs3okk1s50en@4ax.com...
    > In message <hbaglk$k9r$2@snarked.org> "D. Stussy"
    > <spam+newsgroups@bde-arc.ampr.org> was claimed to have wrote:
    > >"DevilsPGD" <DeathToSpam@crazyhat.net> wrote in message
    > >news:ipqfd5dkak1nbniimdgljj6s1tn7aqflro@4ax.com...
    > >> In message <hb8j8i$8ms$1@snarked.org> "D. Stussy"
    > >> <spam+newsgroups@bde-arc.ampr.org> was claimed to have wrote:
    > >> >"Ashish Gupta" <ashish.sarika@gmail.com> wrote in message
    > >>

    >
    >>news:fd35305b-6ab2-4df1-b6f0-3a3044aeda9b@w37g2000prg.googlegroups.com...
    > >> >> 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.
    > >> >
    > >> >Not with a firewall. Your MTA or MSA programs are what you should

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

    > >
    > >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.
    > >

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


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



  12. #12
    D. Stussy
    Guest

    Re: blocking people from attaching files to web based emails

    "DevilsPGD" <DeathToSpam@crazyhat.net> wrote in message
    news:62dkd5dsb0fd659q8b6bbjhs3okk1s50en@4ax.com...
    > In message <hbaglk$k9r$2@snarked.org> "D. Stussy"
    > <spam+newsgroups@bde-arc.ampr.org> was claimed to have wrote:
    > >"DevilsPGD" <DeathToSpam@crazyhat.net> wrote in message
    > >news:ipqfd5dkak1nbniimdgljj6s1tn7aqflro@4ax.com...
    > >> In message <hb8j8i$8ms$1@snarked.org> "D. Stussy"
    > >> <spam+newsgroups@bde-arc.ampr.org> was claimed to have wrote:
    > >> >"Ashish Gupta" <ashish.sarika@gmail.com> wrote in message
    > >>

    >
    >>news:fd35305b-6ab2-4df1-b6f0-3a3044aeda9b@w37g2000prg.googlegroups.com...
    > >> >> 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.
    > >> >
    > >> >Not with a firewall. Your MTA or MSA programs are what you should

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

    > >
    > >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.
    > >

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


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



  13. #13
    D. Stussy
    Guest

    Re: blocking people from attaching files to web based emails

    "DevilsPGD" <DeathToSpam@crazyhat.net> wrote in message
    news:62dkd5dsb0fd659q8b6bbjhs3okk1s50en@4ax.com...
    > In message <hbaglk$k9r$2@snarked.org> "D. Stussy"
    > <spam+newsgroups@bde-arc.ampr.org> was claimed to have wrote:
    > >"DevilsPGD" <DeathToSpam@crazyhat.net> wrote in message
    > >news:ipqfd5dkak1nbniimdgljj6s1tn7aqflro@4ax.com...
    > >> In message <hb8j8i$8ms$1@snarked.org> "D. Stussy"
    > >> <spam+newsgroups@bde-arc.ampr.org> was claimed to have wrote:
    > >> >"Ashish Gupta" <ashish.sarika@gmail.com> wrote in message
    > >>

    >
    >>news:fd35305b-6ab2-4df1-b6f0-3a3044aeda9b@w37g2000prg.googlegroups.com...
    > >> >> 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.
    > >> >
    > >> >Not with a firewall. Your MTA or MSA programs are what you should

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

    > >
    > >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.
    > >

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


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



  14. #14
    D. Stussy
    Guest

    Re: blocking people from attaching files to web based emails

    "DevilsPGD" <DeathToSpam@crazyhat.net> wrote in message
    news:62dkd5dsb0fd659q8b6bbjhs3okk1s50en@4ax.com...
    > In message <hbaglk$k9r$2@snarked.org> "D. Stussy"
    > <spam+newsgroups@bde-arc.ampr.org> was claimed to have wrote:
    > >"DevilsPGD" <DeathToSpam@crazyhat.net> wrote in message
    > >news:ipqfd5dkak1nbniimdgljj6s1tn7aqflro@4ax.com...
    > >> In message <hb8j8i$8ms$1@snarked.org> "D. Stussy"
    > >> <spam+newsgroups@bde-arc.ampr.org> was claimed to have wrote:
    > >> >"Ashish Gupta" <ashish.sarika@gmail.com> wrote in message
    > >>

    >
    >>news:fd35305b-6ab2-4df1-b6f0-3a3044aeda9b@w37g2000prg.googlegroups.com...
    > >> >> 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.
    > >> >
    > >> >Not with a firewall. Your MTA or MSA programs are what you should

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

    > >
    > >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.
    > >

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


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



  15. #15
    D. Stussy
    Guest

    Re: blocking people from attaching files to web based emails

    "DevilsPGD" <DeathToSpam@crazyhat.net> wrote in message
    news:62dkd5dsb0fd659q8b6bbjhs3okk1s50en@4ax.com...
    > In message <hbaglk$k9r$2@snarked.org> "D. Stussy"
    > <spam+newsgroups@bde-arc.ampr.org> was claimed to have wrote:
    > >"DevilsPGD" <DeathToSpam@crazyhat.net> wrote in message
    > >news:ipqfd5dkak1nbniimdgljj6s1tn7aqflro@4ax.com...
    > >> In message <hb8j8i$8ms$1@snarked.org> "D. Stussy"
    > >> <spam+newsgroups@bde-arc.ampr.org> was claimed to have wrote:
    > >> >"Ashish Gupta" <ashish.sarika@gmail.com> wrote in message
    > >>

    >
    >>news:fd35305b-6ab2-4df1-b6f0-3a3044aeda9b@w37g2000prg.googlegroups.com...
    > >> >> 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.
    > >> >
    > >> >Not with a firewall. Your MTA or MSA programs are what you should

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

    > >
    > >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.
    > >

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


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



  16. #16
    Ansgar -59cobalt- Wiechers
    Guest

    Re: blocking people from attaching files to web based emails

    D. Stussy <spam+newsgroups@bde-arc.ampr.org> wrote:
    > "DevilsPGD" <DeathToSpam@crazyhat.net> wrote:
    >>>>> "Ashish Gupta" <ashish.sarika@gmail.com> wrote in message
    >>>>>> 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.

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

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


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

    cu
    59cobalt
    --
    "If a software developer ever believes a rootkit is a necessary part of
    their architecture they should go back and re-architect their solution."
    --Mark Russinovich

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