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On Thursday 28 July 2005 12:50 pm, Matthew Gillen wrote: > bill at horne.net wrote: > > Conclusion: I think Comcast has some automated system that blocks port > > 25 based on criteria they don't want to reveal. The guy I talked to > > said any blocking happens at the cable modem, so I don't know if > > changing the MAC address so as to get a different IP would make any > > difference. > > I know (from looking at my mail server's logs) they run relay tests once > a month or so to see if your server is an open relay. I don't know if > they do anything more sophisticated. This is something you should do yourself occasionally. There are a number of sites that do open relay checks. it is very possible that when discovering an open-relay that Comcast automatically sets a block on port 25. -- Jerry Feldman <gaf at blu.org> Boston Linux and Unix user group http://www.blu.org PGP key id:C5061EA9 PGP Key fingerprint:053C 73EC 3AC1 5C44 3E14 9245 FB00 3ED5 C506 1EA9
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