Am 03/07/2011 05:34 PM, schrieb Sean Carolan: > Can anyone point out reasons why it might be a bad idea to put this > sort of line in your /etc/hosts file, eg, pointing the FQDN at the > loopback address? > > 127.0.0.1 hostname.domain.com hostname localhost localhost.localdomain First, if your host is actually communicating with any kind of ip-based network, it is quite certain, that 127.0.0.1 simply isn't his IP address. And, at least for me, that's a fairly good reason. Second, sendmail had the habit of breaking if your hostname was mapped to 127.0.0.1, but I stopped using sendmail a decade ago, so I can't verify this. :)