As I was lurking on this list I noticed a thread "Question about
Exchange2Aliases" where .local was suggested as an example TLD.

.local should not be used.

RFC2606 specifies that aside from TLDs that have already been allocated (.com, .net, .museum, .info, .uk, etc.), it is also OK to use .test, .example, .invalid, and .localhost. Also, example.com/example.net/example.org are OK to use.

If you have Mac OS X boxes on your network and you want to have them as members of a
Microsoft Active Directory Domain then you cannot use .local as this
extension is used by some OS X service (Rendezvous discovery service I
believe). The TLD ".lan" seems to work and also connotes a "local" area
network. We use .lan for our local DNS services required for Active
Directory. This allows us to manage our local DNS zone "commarts.lan"
without affecting our internet DNS records (on our ISP's DNS servers).

FYI, both ".local" and ".lan" are invalid (and could cause problems now or in the future). If they leak (appearing in E-mail headers, for example), there could be problems. Or, if a TLD you choose becomes allocated in the future, you're going to encounter big problems.


-Scott
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