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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Has postini been taken over?
On Fri, Aug 20, 2004 at 07:53:05AM +0300, Hank Nussbacher wrote: > > At 09:14 AM 19-08-04 -0700, Jay Hennigan wrote: > > >Have you or a mail administrator for your domain signed up with Postini > >for spam filtering? If so, all mail for the domain will flow through > > How exactly does "all mail for the domain will flow through > Postini's servers"? I ask since the IP sending to some postini IP like > exprod5mx30.postini.com is blocked for outgoing port 25+80. That means > that the data is flowing to postini in 1 of the following ways: > > a) auto-GRE tunnels > b) email packaged in some way > c) email is being sent via some dialup/DSL connection to postini You're making this entirely too complicated. Just because mail can't enter postini's network via the address it comes from, doesn't mean it can't enter it on a different IP. Postini's a mail filtering company, I'd be willing to bet they have a lot of IPs that allow inbound mail. :) > I am just trying to understand how postini is bypassing my anti-spam ACLs. Again, you haven't answered his question.... Did your ISP or some other email provider possibly sign up for Postini? How many different domain addresses forward into your account? If you accept mail from any other server for any other domain, that domain could be a postini customer. Postini does not originate or forward spam, they filter mail destined for their customer domains. Some spam gets through their filters, because spammers are smart and adaptively evil. It's really quite simple. -- Ray Wong [email protected]
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