Re: Blocking Outlook External POP/SMTP

[Kurt Buff <kurt.buff () gmail com>]

1) Egress filtering - google is your friend. So is your services file,
which is usually found at either /etc/services or
c:\windows\system32\drivers\etc\services, depending on your platform.

2) Consider the lowly lawsuit over a divorce. If the email of either
the defendant or or plaintiff resides on your mail servers, or an a
machine in your network, and the other side gets a whiff of that, your
org could easily be served to produce the records.

However, you should also block port 25 outbound for all machines
except your actual org mail servers. If your users can get mail but
not respond to it, they usually give up quickly.

On the other hand, what do you propose to do about mail retrieval via
port 80? Are you going to block port 80 to, for instance,
mail.google.com?

Kurt

On Thu, Mar 11, 2010 at 13:40, Hart, Lee Anne
<LeeAnne.Hart () montgomerycollege edu> wrote:
> Hello,
>
> I'm looking for information on preventing/prohibiting users from utilizing
> Outlook (at work) to retrieve their personal email from Gmail, AOL, Yahoo,
> Comcast, Verizon, etc.
>
> Looking for the following:
>
> * Reasons why users should not be allowed to use Outlook on their work
> computers to retrieve their personal email.
>
> * Tools/techniques to block this type of traffic. It seems the most common
> ports are 110, 465, 587, 993, and 995. Are there others?
>
> Any reference are much appreciated.
>
> Thank you!
> Lee Anne

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