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[ NNSquad ] Re: Comcast limits on outbound e-mail traffic?
Hello All, > > All of those facts make a good case for choosing to block outbound > port 25. Should you choose to do that, then your network is less > "neutral" than one that doesn't block outbound port 25. One must consider the effect this has on small business choosing to satisfy its IT needs internally. When I first signed on for cable service with BrightHouse, I found that my IP address was not only on a RBL, but that i had to pay a premium for an IP that could act as an MX to "teh interweb," i.e. any user on a major commercial network using that networks SMTP/POP service. MX worked fine, however, to most anyone running an actual internet host, as the majority of this class of user will not subscribe to RBL services. I was slightly disgruntled at this point, as mail from my own MX to my mother's email account was bounced with an error message telling me I was spam. My frustration rose exponentially when I found that port 80 outbound was also blocked in the upstream routers. I was only able to rememdy this situation with a personal, unannounced visit to the local NOC of the provider, laptop and recent IETF attendee badge in hand and explanation of the end to end architecture of the internet on my lips. Further, the practice of asynchronous throughput with the surplus upstream being syphoned to the carriers datacenters for the purpose of encouraging users to avail themselves of said carriers hosting services does not seem very reasonable either, particularly when there is an additional financial premium placed upon a slightly less asynchronous circuit that is actually capable of providing reasonable http service to more than 2-3 connections simultaneously. Enjoy, Scott