On Wed, Feb 11, 2004 at 03:13:30PM -0500, Sean Donelan wrote:
On Wed, 11 Feb 2004 Valdis.Kletnieks@vt.edu wrote:
On Wed, 11 Feb 2004 11:15:20 PST, Dave Crocker said:
what about port 25 blocking that is now done by many access providers? this makes it impossible for mobile users, coming from those providers, to access your server and do the auth.
Port 587.
So is it time for ISPs to start blocking port 587 too?
If the complaints are going back to the IP address anwyay, why shouldn't an ISP force it subscribers to go through the ISPs mail servers so it can control any messages sent by its subscribers?
My understanding is that in most cases, providers are blocking port 25 outbound to prevent direct to MX spamming from their customers' machines - not to prevent customers from sending mail through other providers' mail servers. Unless they're specifically trying to force people to use their mail servers (which I don't think is usually the case), they don't need to block port 587. -- "Since when is skepticism un-American? Dissent's not treason but they talk like it's the same..." (Sleater-Kinney - "Combat Rock")