> For a reverse DNS test, we've seen rates ranging from about 10% to 25% of > legitimate mailservers having no reverse DNS entry.
One philosophy would consider a mailserver having no reverse DNS entry as not being a legitimate mailserver.
Don't get us started. :)
Seriously, though, that is an acceptable philosophy if [1] you do not mind non-spam getting blocked, and [2] any time that you send out E-mail to someone whose return E-mail may get blocked, you are obligated to let them know what you are doing and how to get around it when replying.
-Scott
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