On Apr 13, 2012, at 13:12, Nathan Sims <[email protected]> wrote:

> What do messages like this mean? (From /var/log/system.log, OSX 10.6.8):
> 
> Apr 13 11:47:08 postfix/smtpd[45990]: warning: 218.95.240.154: hostname 
> 154.240.95.218.broad.xn.qh.dynamic.163data.com.cn verification failed: 
> nodename nor servname provided, or not known

The host name doesn't have a proper rDNS, probably.

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