Does anyone know if there is any imperative (writen or oral) to avoid registering 2 letter second level domains? I know some top level domains refuse to do so based on possible conflicts (due to user misconfigurations) with current or future top level domains, but others allow it. We have a request to register one of these under "es" and I want some advice before saying "yes" or "no". Forbidding to register 2-letter subdomains is pretty hard, but people should *strongly* be advised *not* to register 2-letter subdomains. Practice has shown that people overlook or don't know what RFC822 states in par. 6.2.2, and in their ignorance allow abbreviated addressing. I've seen *LOTS* of mails meant to stay within a CS department, being routed to [the former] Czecho-Slovakia, because there is no way to distinguish between an internal address user@foo.cs (where the FQDN is foo.cs.xxx) and an external address user@foo.cs in Czecho-Slovakia. In your case I'd say registering a domain es.es is almost a guarantee for troubles. Piet