If you're on LinkedIn, and you use a smart phone...

Mon Oct 28 04:19:28 UTC 2013

On Sun, Oct 27, 2013 at 1:19 PM, Jay Ashworth <jra at baylink.com> wrote:

>
> Alas, it can't.  Using it against LI would work, cause you have a hope of
> knowing what address space their proxies are in.
>

LI's behavior is unique.  LI is probably the only one you need to detect.

> You can't do that generically, unless you somehow whitelist the IPs your
> users will be validly coming from, or figure out a way to determine what
> client is connecting.
>

This may be easier than you think,  if remote account access is allowed
only using Web-based mail, and company managed mobile devices.
 Whitelist the  cell carrier's  mobile network, using ActiveSync.

An IMAP connection attempt from anywhere is immediately suspect.

> -- jra
>
--
-JH