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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Misguided SPAM Filtering techniques
> I use an authenticated TLS-protected mailhost at home for submitting my > email for delivery. Unfortunately, networks have taken to: > > outright blocking 25 and 587 except to their own servers. Back in the day AT&T dial-up blocked port 25 outgoing (except to their own servers) for the first month; after that, a user could request an unblock. I believe the SBC/AT&T Borg does the same thing with dynamic DSL IPs. It seems to me that blocking port 25 by default and unblocking on request would be an ideal low-maintenance solution that would reduce spam considerably, and has the added benefit of being on-topic for NANOG. -- Dave Pooser, ACSA Manager of Information Services Alford Media http://www.alfordmedia.com
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