FYI - AOL will not work without reverse DNS
Speaking of this…AOL will not accept email from my server because of this. I don't care to ever send an email to an AOL user, but I have a few with accounts on my server, such as my father, who occasionally do. What is the group's general feeling about this? Keep my heels dug in as a purist?
[1] From http://en.wikipedia.org/wiki/Reverse_DNS_lookup:"Reverse DNS was designed to be primarily a tool for network troubleshooting. However, it is sometimes used as a poor defence against spam. When an Internet mail server receives incoming mail from an external machine, it may check that the reverse DNS record for the IP address of the originating server matches up with name by which the originating server identifies itself during the SMTP greeting. […] This is not a good defence against spam for several reasons. One is that a machine can have more than one IP address and any number of domain names, and the mapping between IP addresses and domain names is essentially arbitrary. Another, perhaps more relevant, reason is that a single client or server machine can legitimately send mail that is "from" an address in a domain different from that of the machine. There is no expected relationship between the domain name of a mail client or server and the domain names of the email addresses whose mail it originates or accepts. This is intentional, and essential to allow the outsourcing of a company's email handling. A third reason is that due to NATs the source IP address seen by the server may be different than the source IP address used by the client."
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