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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: SMTP authentication for broadband providers
On Wed, Feb 11, 2004 at 03:13:30PM -0500, Sean Donelan wrote: > On Wed, 11 Feb 2004 [email protected] 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")
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