Hoi,
On Mon, Oct 25, 2010 at 10:12 AM, Manfredo Miserocchi mis@wari.net wrote:
does none of you use to block port 25 outbound on mailservers ?
The ISP I used to work for was admittedly a business customer oriented one, but we had the corporate philosophy to offer unrestricted and open internet to all of our access customers. This means we fundamentally would not block any outbound ports.
The actual problem is that a mobile customer cannot send out his e-mail from his ISP mailserver, but only from the mobile company one. If this will result true, it will be a strong limitation on the market.
My counsel: chose another ISP and take your business to a place which does not chose the cheap way out (filter for all, ignore the collateral damage).
I believe the best possible choice is to offer by-default restricted (filtered inbound, outbound whatever seems reasonable for the ISP) but allow users to move to a different configuration which is unfiltered entirely. The ISP can detect bad behavior/infected machines (for example search for VIRBL) and force migration to a third (quarantine) pool, or if they don't want to do that, put the user in the restricted pool again.
groet, Pim