Security Basics mailing list archives
Re: educating rDNS violators
From: Derek Schaible <dschaible () cssiinc com>
Date: Sat, 28 Aug 2004 10:13:59 -0400
On Wed, 2004-08-25 at 21:36, Mark Reis wrote:
A question for those who have implemented rDNS restrictions. In the case of a mail server with roaming users, how do you deal with roaming users? A majority of our users travel to conferences and use secure IMAP and SMTP to send their mail. Perhaps this is a misconception, but I thought that some mail clients attempt to portray themselves as a SMTP server relaying through the main mail server. If we have users off traveling and having their email is blocked while they were connected at a hotel with bad rDNS entries, I'd be getting ticked off calls. Any suggestions?
If you are providing a secure SMTP server that requires authentication for your road warriors, rDNS will have no effect on their ability to use it for out-bound mail. When they authenticate, they are added to the valid list of relay clients which will bypass these filters on the server. This is exactly how we provide smtp service for our traveling userbase. HTH -- Derek Schaible <dschaible () cssiinc com> CSSI, Inc.
Attachment:
signature.asc
Description: This is a digitally signed message part
Current thread:
- Re: educating rDNS violators, (continued)
- Re: educating rDNS violators token (Aug 26)
- RE: educating rDNS violators David Gillett (Aug 30)
- Re: educating rDNS violators Niek (Aug 26)
- Re: educating rDNS violators Derek Schaible (Aug 30)
- Re: educating rDNS violators James Kelly (Aug 25)
- Re: educating rDNS violators Bryan S. Sampsel (Aug 25)
- Re: educating rDNS violators SMiller (Aug 26)
- Re: educating rDNS violators Derek Schaible (Aug 25)
- Re: educating rDNS violators Mark Reis (Aug 28)
- Re: educating rDNS violators Derek Schaible (Aug 30)
- Re: educating rDNS violators Bryan S. Sampsel (Aug 30)