Re: Blocking Outlook External POP/SMTP

[Phillip Bailey <pbailey () cryptolife org>]

Hi,

 first you must completely close the firewall and then allow pop3/s -
imap/s - smtp to and from your mail server. This solution won't fix
completely the problem because there's also the webmail that can be
accessed on port 80 and 443, for this issue I can advise to use a good
proxy server with some blacklisting.

Best regards ,

Phillip


Hart, Lee Anne 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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