[NCLUG] comcast blocking port 25?
Bob Proulx
bob at proulx.com
Mon Mar 26 13:46:56 MDT 2007
DJ Eshelman wrote:
> Now for the question:
> Is it possible for mail from a dynamic IP to have a reverse DNS
> entry?
Not usually. It is possible if the folks authoritative for that IP
address block allow and enable dynamic dns updates. This is typical
on the local network but I have never seen the big ISPs provide that.
> How did you go about detecting if it was from a Dynamic IP or not?
The dul.dnsbl.sorbs.net RBL provides a reasonable list. At least I
have not had any problems with it. I am sure it is not perfect though
because I don't see how anything could be.
http://www.au.sorbs.net/faq/dul.shtml
http://www.au.sorbs.net/using.shtml
Bob
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