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[ NNSquad ] Re: Comcast limits on outbound e-mail traffic?
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 In message <200711121813.lACIDxtA003351@chrome.vortex.com>, Lauren Weinstein <email@example.com> writes >Over on the NNSquad Forum, a poster is claiming that Comcast enforces a >"secret" limit of 50 outbound e-mails per some (undisclosed) period of time >for residential (presumably dynamic IP address) subscribers >( http://forums.pfir.org/main/messages/714/777.html ). > >Can anyone verify or provide more information on this matter It continues to surprise me how little users seem to know about the ISP business operates :( This is commonplace. In fact Comcast have a non-secret limit of 1000 recipients: http://www.comcast.com/customers/faq/FaqDetails.ashx?Id=4394 and Dr Occam would suggest that mechanism was considered first. >or >similar limits, if actually present, at other ISPs? Service protection measures are very common (if an ISP's outbound email service sends a lot of spam it gets blacklisted, which causes havoc for all of the other customers). MTAs these days tend to have out-of-the-box provisions for such schemes... ... here's a description of Exim's facilities <URL:http://www.exim.org/exim-html-current/doc/html/spec_html/ch40.html# SECTratelimiting> ... and here's where they came from http://www.ukuug.org/events/spring2006/programme/TFinch.html They're usually set high enough that no-one notices (because otherwise it costs the ISP a fortune in hand-holding legitimate customers). Personally I'd argue that hard limits on emails or destinations are just being lazy, you can get better results by counting delivery _failures_ since properly run mailing lists and mailshots don't get many failures, whereas spam runs do. - -- Richard Clayton <richard.clayton @ cl.cam.ac.uk> Computer Laboratory, University of Cambridge, CB3 0FD -----BEGIN PGP SIGNATURE----- Version: PGPsdk version 1.7.1 iQA/AwUBRzigZ5oAxkTY1oPiEQKiZgCcDIHBITRtp5yRsJvw3Kp6SVTeIhUAoI2a GPwmL919+sAgeVu5tUsIaxf6 =ZAru -----END PGP SIGNATURE-----