Miguel A. Lerma wrote: > I have a mail server with sendmail running on Scientific Linux 5.1. > I would like to check SPF (Sender Policy Framework) on incoming > mail. Does anybody have experience with this? I used to be on a couple of antispam lists, whose names I now don't recall. There was much discussion of SPF and CSV, and I hadn't a clue what they were talking about, so I asked. From the explanations there, and articles in other places, I quickly decided it's inherently broken. Since then, I've forgotten much of the argument, but a quick google turned up this: http://homepages.tesco.net/J.deBoynePollard/FGA/smtp-spf-is-harmful.html A key point is this: "SPF runs fundamentally counter to this architecture. The primary design of SPF is that the owner of a domain name publishes a list of SMTP Relay client machines associated with that domain, and that SMTP Relay servers reject mail with any such envelope sender mailbox names that does not come from an SMTP Relay client that is on that list. The architecture that SPF thus actually mandates is one where mail is delivered directly from originator to recipient, with no "store and forward" hops in between." This gives an overview of many more antispam techniques than I know of: http://www.oecd-antispam.org/article.php3?id_article=241 Recently, I've seen several questions asked by people implementing SPF, so this leads me to ask, "Why is it so?? -- Cheers John -- spambait [log in to unmask] [log in to unmask] -- Advice http://webfoot.com/advice/email.top.php http://www.catb.org/~esr/faqs/smart-questions.html http://support.microsoft.com/kb/555375 You cannot reply off-list:-)