On Thu, 18 Aug 2005, Steven Wayne wrote: > > I didn't know mx records couldn't be ip addresses....
RFC 1034: "The MX RRs have an RDATA section which consists of a 16 bit number followed by a domain name." RFC 974: "For the purposes of message routing, the system stores RRs known as MX RRs. Each MX matches a domain name with two pieces of data, a preference value (an unsigned 16-bit integer), and the name of a host." Note that, as a result of pressure long ago from a certain multinational company whose name starts with the digit 3, components of domain names are permitted start with digits. Thus, an IPv4 address is a syntactically valid domain name. A nameserver cannot therefore object to being told to load a record such as xxx MX 1 1.2.3.4 because, syntactically, "1.2.3.4" *could* be a domain name. Sigh. -- Philip Hazel University of Cambridge Computing Service, [EMAIL PROTECTED] Cambridge, England. Phone: +44 1223 334714. Get the Exim 4 book: http://www.uit.co.uk/exim-book -- ## List details at http://www.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://www.exim.org/eximwiki/
