Re: Blocking Outlook External POP/SMTP

[Jon Janego <jonjanego () gmail com>]

If your business runs its own DNS, the simplest way would be to block
those domains at the DNS level.  If you're using an
externally-provided DNS server, many commercial products also let you
granularly block sites.  OpenDNS is one that comes to mind.

On Thu, Mar 11, 2010 at 4:40 PM, 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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