Date: Wed, 1 Jun 2005 14:35:56 -0700 (PDT) From: Philip Hallstrom <freebsd@philip.pjkh.com> To: Jorn Argelo <jorn@wcborstel.nl> Cc: FreeBSD Mailing List <freebsd-questions@freebsd.org>, "Chad Leigh -- Shire.Net LLC" <chad@shire.net>, Bart Silverstrim <bsilver@chrononomicon.com> Subject: Re: postgrey question Message-ID: <20050601143415.D69453@wolf.pjkh.com> In-Reply-To: <429E25BB.9080006@wcborstel.nl> References: <0a6397740f09ea4ac7cce0b1bead3bde@chrononomicon.com> <8B6C5637-F4B3-4635-94EA-F1B8EE9D8A2F@shire.net> <429E25BB.9080006@wcborstel.nl>
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[description of postgrey snipped] > The main advantage of this is that spammers and viruses have massive amount > of email lists and just try to send it to as many people as possible. They > are not going to wait and try to send the e-mail again, thus you effectively > block many amount of spam and virus e-mail before it's even being processed > by amavis / clamav / spamassasin, saving up system resources. This is also the problem with greylisting... some services only attempt to send the email once and if it fails, give up completely. I don't remember if postgrey comes with a whitelist of IP addresses or not, but I do remember seeing a list that included things such as Southwest Airlines ticket confirmations and some amazon stuff. Anyway, that's something to watch out for if it's relevant for you...
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