On Thu, Oct 22, 2009 at 11:40:34PM -0500, Shawn McKenzie wrote: <snip> > This is fairly accurate in premise but just to clarify. Mailservers > don't operate like this by default and there is really no "trust". > There are public blacklists that a mailserver can be configured to use > that tell the mailserver not to accept mail from servers on the > blacklist. The blacklists may contain servers that allow anyone to > relay email, compromised servers, servers known for spam, ip ranges > known to be held by spammers and *ranges that ISPs designate as dynamic > or used for subscribers (DSL, cable, dial-up customers, etc. because > they shouldn't be relaying email). Regarding the rejection of dynamic IPs by smarthosts, are you saying that it's a "blacklist" of sorts that lets them know an IP is dynamic? (Serious question. I don't know the mechanism by which they determine what is and isn't a dynamic IP.) Paul -- Paul M. Foster -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
