Security Basics mailing list archives
RE: Blocking Outlook External POP/SMTP
From: Jay Vlavianos <jvlavianos () ecastnetwork com>
Date: Mon, 15 Mar 2010 15:35:52 -0700
You could always look into an EIM product like Websense(tm) to manage blocking at the service level instead of the port level. Things like webmail are tough to get around, especially with Exchange funneling everything over port 80/443 now at the CAS layer (which Outlook can use as a server source). At the end of the day, though, an enterprising user could get around port blocking in many ways including tunneling it though ICMP if need be (see PingTunnel http://www.cs.uit.no/~daniels/PingTunnel/) -----Original Message----- From: listbounce () securityfocus com [mailto:listbounce () securityfocus com] On Behalf Of Hart, Lee Anne Sent: Thursday, March 11, 2010 1:41 PM To: 'security-basics () securityfocus com'; 'firewalls () securityfocus com' Subject: Blocking Outlook External POP/SMTP 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 ------------------------------------------------------------------------ Securing Apache Web Server with thawte Digital Certificate In this guide we examine the importance of Apache-SSL and who needs an SSL certificate. We look at how SSL works, how it benefits your company and how your customers can tell if a site is secure. You will find out how to test, purchase, install and use a thawte Digital Certificate on your Apache web server. Throughout, best practices for set-up are highlighted to help you ensure efficient ongoing management of your encryption keys and digital certificates. http://www.dinclinx.com/Redirect.aspx?36;4175;25;1371;0;5;946;e13b6be442f727d1 ------------------------------------------------------------------------
Current thread:
- Blocking Outlook External POP/SMTP Hart, Lee Anne (Mar 15)
- Re: Blocking Outlook External POP/SMTP Ansgar Wiechers (Mar 15)
- Re: Blocking Outlook External POP/SMTP Gareth Fletcher (Mar 16)
- Re: Blocking Outlook External POP/SMTP Gichuki John Chuksjonia (Mar 16)
- Re: Blocking Outlook External POP/SMTP Stephen Mullins (Mar 16)
- Re: Blocking Outlook External POP/SMTP Kurt Buff (Mar 16)
- RE: Blocking Outlook External POP/SMTP Jay Vlavianos (Mar 16)
- Re: Blocking Outlook External POP/SMTP phillip bailey (Mar 16)
- Re: Blocking Outlook External POP/SMTP Jon Janego (Mar 16)
- Re: Blocking Outlook External POP/SMTP gig (Mar 16)
- Re: Blocking Outlook External POP/SMTP Phillip Bailey (Mar 16)
- Re: Blocking Outlook External POP/SMTP Pierre Jaury (Mar 16)
- Re: Blocking Outlook External POP/SMTP Nikhil Wagholikar (Mar 16)
- RE: Blocking Outlook External POP/SMTP Christian Campbell (Mar 22)
- Re: Blocking Outlook External POP/SMTP Francois Yang (Mar 22)
- <Possible follow-ups>
- Re: Blocking Outlook External POP/SMTP krymson (Mar 17)