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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: AOL rejecting mail from IP's w/o reverse DNS ?
Greg Maxwell writes on 12/3/2003 11:39 AM: What about speaking plain old smtp, but with transport / mailertable rules routing all mail for domain X (say AOL or MSN) to "special access" servers that have firewall ACLs allowing only connections from a restricted set of IPs?Seriously, do we really need SMTP peering agreements? I don't know of too many places that are UUCPing their email... SMTP traffic already crosses (BGP) peering agreement controlled links. If putting contractional obligations there fails to work why should we believe some new and less understood system would be any more effective? So AOL talks to (say) us and says "hey, instead of mail from our users waiting like all other mail to connect to port 25 on your MXs, set aside a cluster of MXs that'll permit smtp connections from [this /24]" We then take these emails and deliver them as usual. Just that AOL mail to our users gets delivered faster, doesn't clutter our MXs ... and we can send mail to AOL over a similar back channel. As a bonus, monitoring and controlling spam on these would be far easier. Yes it won't scale. But it is not intended to scale - it is just intended to be a series of agreements between large providers that will - * reduce congestion / endless mail queues on regular MXs / outbound machines. * let inbound / outbound flowing through that back channel get more easily managed [and monitored for spam] than if it were to take the usual route. Think of it as taking a short cut through a toll road instead of the usual toll free traffic jammed highway. srs -- srs (postmaster|suresh)@outblaze.com // gpg : EDEDEFB9 manager, outblaze.com security and antispam operations
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