Never-mind the side-effects. It might not even work! This article is awfully one-sided. NPR recently had a much more in-depth overview into the debate about resveratrol and aging. Basically no one has been able to reproduce the original study with the same results, the original authors have even lowered their initial claims, and a few articles published in Nature even dispute that resveratrol activates sirtuins (the claimed mechanism that "prevents aging").

Also, lifespans are actually *falling* in many communities (in the US at least). Contrary to what big pharma wants you to believe, well-being also includes healthy lifestyle and nutrition, not just some expensive pills.

If you want your email server to actual deliver mail, rDNS is required as many major email providers like AOL and MSN/Hotmail now require them to even accept incoming connections. It doesn't matter what anyone thinks about it, it's already a standard because of this.

I would not configure any servers to reject mail outright originating from servers without rDNS though. As the OP notes there are some legit servers whose admins apparently did not get the memo or do not care about delivery rates (if your ISP will not allow valid rDNS switch hosts or sign up for a free Google Apps for your domain, your mail deliver rates will be absurdly low without rDNS). Like someone else suggested a SpamAssassin/SCL rule to put it in a Junk folder instead would allow the one off legit message to be retrieved.

Although still imperfect, DNSBLs like Spamhaus and Barracuda seem to be a safer method to block spammy servers outright.