> -----Original Message----- > From: Bob Apthorpe > Sent: Friday, October 31, 2003 1:03 PM > To: [EMAIL PROTECTED] > Subject: Re: [SAtalk] Rule for reverse lookup similarities >
--snip-- > The big problem is when ISPs don't differentiate their static > allocations from their dynamic allocations, either by rDNS or > by network block. My tiny single-person domain has dropped 75 > spam attempts from dynamic allocations this month. Compare > this to 324 failed attempts to send mail vi open proxies > (also note that I run my proxy rules before my dynamic rules, > so it's likely that many of the open proxies are also in > dynamic pools.) For me, a criteria in choosing a provider was the ability to provide a subnet of static IP addresses *and* the provider had to support reverse DNS for the block. And while pricey, MegaPath does a very good job. I was trying to switch to Covad as they were cheaper and seemed to fit my requirements. But Covad could not handle the simple task of switching my service. > The bar is being raised for mail service operators. You need > a static IP address, resolving forward and reverse DNS, and > resolvable HELO to talk to directly to my mail system. If you > can't configure your mail system properly, send mail through > your ISP's server or smarthost via a trustworthy friend (not > an open relay or proxy; those get dropped too.) One thing that I have not heard to help stem FPs is requiring the sending host to helo/ehlo with a FQDN format. I find I will kill a lot of broadband direct connects as most directs seem to not want to helo in FQDN format. > Setting rDNS is the most difficult of the lot because it > means you need your ISP's cooperation and if you're on a > large or isolated provider, the time, irritation, and cost of > getting them to change a few lines of text in a zone file may > be prohibitive. I still don't understand why these "service" providers do not provide service. I hate telecom companies. --Larry ------------------------------------------------------- This SF.net email is sponsored by: SF.net Giveback Program. Does SourceForge.net help you be more productive? Does it help you create better code? SHARE THE LOVE, and help us help YOU! Click Here: http://sourceforge.net/donate/ _______________________________________________ Spamassassin-talk mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/spamassassin-talk
